ThinkWiki - User contributions [en]

How to rotate X41t screen with gravity sensor(hdaps)

2008-12-08T23:57:01Z

Jonasbergel:

[[:Category:X41 Tablet|X41 Tablet]][[Category:X41 Tablet]][[Category:Scripts]]

The X41t has a acceleration sensor build in. Originally it can protect the hard drive, if Laptop is falling down. See the [[HDAPS]] Page.
Now lets use that for funny stuff like emulate a joystick for Neverball [http://de.wikipedia.org/wiki/Neverball]. Or we use it for a very useful thing: Rotating the screen by recognizing where is downward. Like a lot of handy tools, like mobiles, mp3 player or photo cameras.

Basic concept is the following:
-Rotate the screen and the stylus to the steepest decent direction.
-Rotate only in stylus mode.
-Rotate only if it is really necessary.
-Rotate only if it cants more than 10 degrees.
-An easy program.

There are other programs witch can do that, but I have not found one that works out off the box. And I can not understand that much ''python''. So I tried it out myself.
I have written a set of small ''shell'' scripts that rotates the screen of the X41 Tablet by using the gravity sensor coordinates and some ACPI events.
It consist of two parts, fist the main part that contains the code for deciding and rotating and the second part which starts and stops the fist one. Maybe some one can make suggestions to get this in a real deamon style.

I have tested it on an x41t with ubuntu 8.04 with the standard kernel 2.6.24-19-generic.
''sudo apt-get install x11-xserver-utils wacom-tools'' should install all stuff.

First Part. Usually this is saved as {{path|/etc/acpid/x41t_gravity}}

#!/bin/bash

#usage: just start or kill it

#load configuration
. /etc/gravity/gravity.conf

get_orientation(){
string=`cat /sys/devices/platform/hdaps/position`
string=`echo $string | tr -d '[=-=][:blank:][=(=][=)=]'`
x=`echo $string | awk -v FS="," '{print $1}'`
y=`echo $string | awk -v FS="," '{print $2}'`
dx=`expr $x - $x_horizontal` #dx away from middle
dy=`expr $y - $y_horizontal` #dy away form the middle

#get actual orientation from last rotation, saved in a file :
if [ ! -f /tmp/actual_orientation.txt ];then
echo 0 > /tmp/actual_orientation.txt #0 means normal orientation
fi
actual_orientation=`cat /tmp/actual_orientation.txt`
}

prepare_rotate(){
echo "Nothing to prepare. I can rotate now."
#ps -A | grep compiz.real && (kwin --replace)& #because compiz sometimes crashes.
}

do_rotate(){
prepare_rotate
#rotate screen
xrandr -o $1
#rotate stylus
case $1 in
right)
/usr/bin/xsetwacom set stylus rotate 1;;
left)
/usr/bin/xsetwacom set stylus rotate 2;;
inverted)
/usr/bin/xsetwacom set stylus rotate 3;;
*)
/usr/bin/xsetwacom set stylus rotate 0;;
esac
#save the orientation
echo $1 > /tmp/actual_orientation.txt
}

######### Main ########################

while [ true ]; do
get_orientation
if [ `expr $dx \* $dx` -ge `expr $dy \* $dy` ];then #checks for the absolute greater value
if [ $dx -gt $eps ] && [ ! $actual_orientation = right ] ;then #check if the screen have to rotate
do_rotate right
elif [ $dx -lt -$eps ] && [ ! $actual_orientation = left ];then #check if the screen have to rotate
do_rotate left
fi
else
if [ $dy -gt $eps ] && [ ! $actual_orientation = normal ];then #check if the screen have to rotate
do_rotate normal
elif [ $dy -lt -$eps ] && [ ! $actual_orientation = inverted ];then #check if the screen have to rotate
do_rotate inverted
fi
fi
sleep 1
done

exit 0

Second Part. Usually this is saved as {{path|/etc/acpid/x41t_control_gravity.sh}}

#!/bin/bash

#load configuration
. /etc/gravity/gravity.conf

################ set DISPLAY ####################
export DISPLAY=$Default_DISPLAY #a work around for right DISPLAY varialbe (I do not like it).
export XAUTHORITY=$Default_XAUTHORITY
xset -display $DISPLAY dpms

################# Main ##########################

if [ ! $1 ] || [ ! $1 = start ];then
killall x41t_gravity #return to normal state
xrandr -o normal
/usr/bin/xsetwacom set stylus rotate 0
rm /tmp/actual_orientation.txt
elif [ $1 = start ];then
#check for the kernel modul for gyroscope
lsmod | grep hdaps || modprobe hdaps
lsmod | grep hdaps || exit 1
(/etc/acpi/x41t_gravity)& #will be endless repeated (kill see up)
fi

exit 0

Some settings that have to tune. Usually this is saved as {{path|/etc/gravity/gravity.conf}}

x_horizontal=433 #horizontal position, get it by calibration
y_horizontal=390 #just read the value in /sys/devices/platform/hdaps/position
#the first value is x, second one is y

eps=40 #define a neighbourhood interpreted as horizontal

Default_DISPLAY=":0.0"
Default_XAUTHORITY=/home/smjb0803/.Xauthority

Now lets begin! Just add two ACPI events, first to start the ''x41t_gravity'', second for ending it.

Fist. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-down}}.
# /etc/acpi/events/x41t-swivel-down
# called when tablet head swivels down
event=ibm/hotkey HKEY 00000080 00005009
action=/etc/acpi/x41t_control_gravity.sh start

Second. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-up}}.
# /etc/acpi/events/x41t-swivel-up
# called when tablet head swivels up
event=ibm/hotkey HKEY 00000080 0000500a
action=/etc/acpi/x41t_control_gravity.sh stop

And restart the ACPID.
sudo /etc/init.d/acpid restart

That`s it. Have fun and make suggestions. Please use it only if you trust in it. On personal risk. You have to prevent losing data.
--[[User:Jonasbergel|Jonasbergel]] 09:27, 16 October 2008 (CEST)

How to rotate X41t screen with gravity sensor(hdaps)

2008-10-20T21:08:25Z

Jonasbergel:

[[:Category:X41 Tablet|X41 Tablet]][[Category:X41 Tablet]][[Category:Scripts]]

The X41t has a acceleration sensor build in. Originally it can protect the hard drive, if Laptop is falling down. See the [[HDAPS]] Page.
Now lets use that for funny stuff like emulate a joystick for Neverball [http://de.wikipedia.org/wiki/Neverball]. Or we use it for a very useful thing: Rotating the screen by recognizing where is downward. Like a lot of handy tools, like mobiles, mp3 player or photo cameras.

Basic concept is the following:
-Rotate the screen and the stylus to the steepest decent direction.
-Rotate only in stylus mode.
-Rotate only if it is really necessary.
-Rotate only if it cants more than 10 degrees.
-An easy program.

There are other programs witch can do that, but I have not found one that works out off the box. And I can not understand that much ''python''. So I tried it out myself.
I have written a set of small ''shell'' scripts that rotates the screen of the X41 Tablet by using the gravity sensor coordinates and some ACPI events.
It consist of two parts, fist the main part that contains the code for deciding and rotating and the second part which starts and stops the fist one. Maybe some one can make suggestions to get this in a real deamon style.

I have tested it on an x41t with ubuntu 8.04 with the standard kernel 2.6.24-19-generic.
''sudo apt-get install x11-xserver-utils wacom-tools'' should install all stuff.

First Part. Usually this is saved as {{path|/etc/acpid/x41t_gravity}}

#!/bin/bash

#usage: just start or kill it

#load configuration
. /etc/gravity/gravity.conf

get_orientation(){
string=`cat /sys/devices/platform/hdaps/position`
string=`echo $string | tr -d '[=-=][:blank:][=(=][=)=]'`
x=`echo $string | awk -v FS="," '{print $1}'`
y=`echo $string | awk -v FS="," '{print $2}'`
dx=`expr $x - $x_horizontal` #dx away from middle
dy=`expr $y - $y_horizontal` #dy away form the middle

#get actual orientation from last rotation, saved in a file :
if [ ! -f /tmp/actual_orientation.txt ];then
echo 0 > /tmp/actual_orientation.txt #0 means normal orientation
fi
actual_orientation=`cat /tmp/actual_orientation.txt`
}

prepare_rotate(){
echo "Nothing to prepare. I can rotate now."
#ps -A | grep compiz.real && (kwin --replace)& #because compiz sometimes crashes.
}

do_rotate(){
prepare_rotate
#rotate screen
xrandr -o $1
#rotate stylus
case $1 in
right)
/usr/bin/xsetwacom set stylus rotate 1;;
left)
/usr/bin/xsetwacom set stylus rotate 2;;
inverted)
/usr/bin/xsetwacom set stylus rotate 3;;
*)
/usr/bin/xsetwacom set stylus rotate 0;;
esac
#save the orientation
echo $1 > /tmp/actual_orientation.txt
}

######### Main ########################

while [ true ]; do
get_orientation
if [ `expr $dx \* $dx` -ge `expr $dy \* $dy` ];then #checks for the absolute greater value
if [ $dx -gt $eps ] && [ ! $actual_orientation = right ] ;then #check if the screen have to rotate
do_rotate right
elif [ $dx -lt -$eps ] && [ ! $actual_orientation = left ];then #check if the screen have to rotate
do_rotate left
fi
else
if [ $dy -gt $eps ] && [ ! $actual_orientation = normal ];then #check if the screen have to rotate
do_rotate normal
elif [ $dy -lt -$eps ] && [ ! $actual_orientation = inverted ];then #check if the screen have to rotate
do_rotate inverted
fi
fi
sleep 1
done

exit 0

Second Part. Usually this is saved as {{path|/etc/acpid/x41t_control_gravity.sh}}

#!/bin/bash

#load configuration
. /etc/gravity/gravity.conf

################ set DISPLAY ####################
export DISPLAY=$Default_DISPLAY #a work around for right DISPLAY varialbe (I do not like it).
export XAUTHORITY=$Default_XAUTHORITY
xset -display $DISPLAY dpms

################# Main ##########################

if [ ! $1 ] || [ ! $1 = start ];then
killall x41t_gravity #return to normal state
xrandr -o normal
/usr/bin/xsetwacom set stylus rotate 0
rm /tmp/actual_orientation.txt
elif [ $1 = start ];then
#check for the kernel modul for gyroscope
lsmod | grep hdaps || modprobe hdaps
lsmod | grep hdaps || exit 1
(/etc/acpi/x41t_gravity)& #will be endless repeated (kill see up)
fi

exit 0

Some settings that have to tune. Usually this is saved as {{path|/etc/gravity/gravity.conf}}

x_horizontal=433 #horizontal position, get it by calibration
y_horizontal=390 #just read the value in /sys/devices/platform/hdaps/position
#the first value is x, second one is y

eps=40 #define a neighbourhood interpreted as horizontal

Default_DISPLAY=":0.0"
Default_XAUTHORITY=/home/smjb0803/.Xauthority

Now lets begin! Just add two ACPI events, first to start the ''x41t_gravity'', second for ending it.

Fist. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-down}}.
# /etc/acpi/events/x41t-swivel-down
# called when tablet head swivels down
event=ibm/hotkey HKEY 00000080 00005009
action=/etc/acpi/x41t_control_gravity.sh start

Second. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-up}}.
# /etc/acpi/events/x41t-swivel-up
# called when tablet head swivels up
event=ibm/hotkey HKEY 00000080 0000500a
action=/etc/acpi/x41t_control_gravity.sh stop

And restart the ACPID.
sudo /etc/init.d/acpid restart

That`s it. Have fun and make suggestions. Please use it only if you trust in it. On personal risk. Prevent lost data yourselves.
--[[User:Jonasbergel|Jonasbergel]] 09:27, 16 October 2008 (CEST)

How to rotate X41t screen with gravity sensor(hdaps)

2008-10-16T13:00:20Z

Jonasbergel:

[[:Category:X41 Tablet|X41 Tablet]][[Category:X41 Tablet]][[Category:Scripts]]

The X41t has a acceleration sensor build in. Originally it can protect the hard drive, if Laptop is falling down. See the [[HDAPS]] Page.
Now lets use that for funny stuff like emulate a joystick for Neverball [http://de.wikipedia.org/wiki/Neverball]. Or we use it for a very useful thing: Rotating the screen by recognizing where is downward. Like a lot of handy tools, like mobiles, mp3 player or photo cameras.

Basic concept is the following:
-Rotate the screen and the stylus to the steepest decent direction.
-Rotate only in stylus mode.
-Rotate only if it is really necessary.
-Rotate only if it cants more than 10 degrees.
-An easy program.

There are other programs witch can do that, but I have not found one that works out off the box. And I can not understand that much ''python''. So I tried it out myself.
I have written a set of small ''shell'' scripts that rotates the screen of the X41 Tablet by using the gravity sensor coordinates and some ACPI events.
It consist of two parts, fist the main part that contains the code for deciding and rotating and the second part which starts and stops the fist one. Maybe some one can make suggestions to get this in a real deamon style.

I have tested it on an x41t with ubuntu 8.04 with the standard kernel 2.6.24-19-generic.
''sudo apt-get install xset x11-xserver-utils wacom-tools'' should install all stuff.

First Part. Usually this is saved as {{path|/etc/acpid/x41t_gravity}}

#!/bin/bash

#usage: just start or kill it

#load configuration
. /etc/gravity/gravity.conf

get_orientation(){
string=`cat /sys/devices/platform/hdaps/position`
string=`echo $string | tr -d '[=-=][:blank:][=(=][=)=]'`
x=`echo $string | awk -v FS="," '{print $1}'`
y=`echo $string | awk -v FS="," '{print $2}'`
dx=`expr $x - $x_horizontal` #dx away from middle
dy=`expr $y - $y_horizontal` #dy away form the middle

#get actual orientation from last rotation, saved in a file :
if [ ! -f /tmp/actual_orientation.txt ];then
echo 0 > /tmp/actual_orientation.txt #0 means normal orientation
fi
actual_orientation=`cat /tmp/actual_orientation.txt`
}

prepare_rotate(){
echo "Nothing to prepare. I can rotate now."
#ps -A | grep compiz.real && (kwin --replace)& #because compiz sometimes crashes.
}

do_rotate(){
prepare_rotate
#rotate screen
xrandr -o $1
#rotate stylus
case $1 in
right)
/usr/bin/xsetwacom set stylus rotate 1;;
left)
/usr/bin/xsetwacom set stylus rotate 2;;
inverted)
/usr/bin/xsetwacom set stylus rotate 3;;
*)
/usr/bin/xsetwacom set stylus rotate 0;;
esac
#save the orientation
echo $1 > /tmp/actual_orientation.txt
}

######### Main ########################

while [ true ]; do
get_orientation
if [ `expr $dx \* $dx` -ge `expr $dy \* $dy` ];then #checks for the absolute greater value
if [ $dx -gt $eps ] && [ ! $actual_orientation = right ] ;then #check if the screen have to rotate
do_rotate right
elif [ $dx -lt -$eps ] && [ ! $actual_orientation = left ];then #check if the screen have to rotate
do_rotate left
fi
else
if [ $dy -gt $eps ] && [ ! $actual_orientation = normal ];then #check if the screen have to rotate
do_rotate normal
elif [ $dy -lt -$eps ] && [ ! $actual_orientation = inverted ];then #check if the screen have to rotate
do_rotate inverted
fi
fi
sleep 1
done

exit 0

Second Part. Usually this is saved as {{path|/etc/acpid/x41t_control_gravity.sh}}

#!/bin/bash

#load configuration
. /etc/gravity/gravity.conf

################ set DISPLAY ####################
export DISPLAY=$Default_DISPLAY #a work around for right DISPLAY varialbe (I do not like it).
export XAUTHORITY=$Default_XAUTHORITY
xset -display $DISPLAY dpms

################# Main ##########################

if [ ! $1 ] || [ ! $1 = start ];then
killall x41t_gravity #return to normal state
xrandr -o normal
/usr/bin/xsetwacom set stylus rotate 0
rm /tmp/actual_orientation.txt
elif [ $1 = start ];then
#check for the kernel modul for gyroscope
lsmod | grep hdaps || modprobe hdaps
lsmod | grep hdaps || exit 1
(/etc/acpi/x41t_gravity)& #will be endless repeated (kill see up)
fi

exit 0

Some settings that have to tune. Usually this is saved as {{path|/etc/gravity/gravity.conf}}

x_horizontal=433 #horizontal position, get it by calibration
y_horizontal=390 #just read the value in /sys/devices/platform/hdaps/position
#the first value is x, second one is y

eps=40 #define a neighbourhood interpreted as horizontal

Default_DISPLAY=":0.0"
Default_XAUTHORITY=/home/smjb0803/.Xauthority

Now lets begin! Just add two ACPI events, first to start the ''x41t_gravity'', second for ending it.

Fist. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-down}}.
# /etc/acpi/events/x41t-swivel-down
# called when tablet head swivels down
event=ibm/hotkey HKEY 00000080 00005009
action=/etc/acpi/x41t_control_gravity.sh start

Second. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-up}}.
# /etc/acpi/events/x41t-swivel-up
# called when tablet head swivels up
event=ibm/hotkey HKEY 00000080 0000500a
action=/etc/acpi/x41t_control_gravity.sh stop

And restart the ACPID.
sudo /etc/init.d/acpid restart

That`s it. Have fun and make suggestions. Please use it only if you trust in it. On personal risk. Prevent lost data yourselves.
--[[User:Jonasbergel|Jonasbergel]] 09:27, 16 October 2008 (CEST)

How to rotate X41t screen with gravity sensor(hdaps)

2008-10-16T12:15:29Z

Jonasbergel: How to rotate X41t screen with gravity sensor

[[:Category:X41 Tablet|X41 Tablet]][[Category:X41 Tablet]][[Category:Scripts]]

The X41t has a acceleration sensor build in. Originally it can protect the hard drive, if Laptop is falling down. See the [[HDAPS]] Page.
Now lets use that for funny stuff like emulate a joystick for Neverball [http://de.wikipedia.org/wiki/Neverball]. Or we use it for a very useful thing: Rotating the screen by recognizing where is downward. Like a lot of handy tools, like mobiles, mp3 player or photo cameras.

Basic concept is the following:
-Rotate the screen and the stylus to the steepest decent direction.
-Rotate only in stylus mode.
-Rotate only if it is really necessary.
-Rotate only if it cants more than 10 degrees.
-An easy program.

There are other programs witch can do that, but I have not found one that works out off the box. And I can not understand that much ''python''. So I tried it out myself.
I have written a set of small ''shell'' scripts that rotates the screen of the X41 Tablet by using the gravity sensor coordinates and some ACPI events.
It consist of two parts, fist the main part that contains the code for deciding and rotating and the second part which starts and stops the fist one. Maybe some one can make suggestions to get this in a real deamon style.

I have tested it on an x41t with ubuntu 8.04 with the standard kernel 2.6.24-19-generic.
''sudo apt-get install xset x11-xserver-utils wacom-tools'' should install all stuff.

First Part. Usually this is saved as {{path|/etc/acpid/x41t_gravity}}

#!/bin/bash

#usage: just start or kill it

#load configuration
. /etc/gravity/gravity.conf

get_orientation(){
string=`cat /sys/devices/platform/hdaps/position`
string=`echo $string | tr -d '[=-=][:blank:][=(=][=)=]'`
x=`echo $string | awk -v FS="," '{print $1}'`
y=`echo $string | awk -v FS="," '{print $2}'`
dx=`expr $x - $x_horizontal` #dx away from middle
dy=`expr $y - $y_horizontal` #dy away form the middle

#get actual orientation from last rotation, saved in a file :
if [ ! -f /tmp/actual_orientation.txt ];then
echo 0 > /tmp/actual_orientation.txt #0 means normal orientation
fi
actual_orientation=`cat /tmp/actual_orientation.txt`
}

prepare_rotate(){
echo "Nothing to prepare. I can rotate now."
#ps -A | grep compiz.real && (kwin --replace)& #because compiz sometimes crashes.
}

do_rotate(){
prepare_rotate
#rotate screen
xrandr -o $1
#rotate stylus
case $1 in
right)
/usr/bin/xsetwacom set stylus rotate 1;;
left)
/usr/bin/xsetwacom set stylus rotate 2;;
inverted)
/usr/bin/xsetwacom set stylus rotate 3;;
*)
/usr/bin/xsetwacom set stylus rotate 0;;
esac
#save the orientation
echo $1 > /tmp/actual_orientation.txt
}

######### Main ########################

while [ true ]; do
get_orientation
if [ `expr $dx \* $dx` -ge `expr $dy \* $dy` ];then #checks for the absolute greater value
if [ $dx -gt $eps ] && [ ! $actual_orientation = right ] ;then #check if the screen have to rotate
do_rotate right
elif [ $dx -lt -$eps ] && [ ! $actual_orientation = left ];then #check if the screen have to rotate
do_rotate left
fi
else
if [ $dy -gt $eps ] && [ ! $actual_orientation = normal ];then #check if the screen have to rotate
do_rotate normal
elif [ $dy -lt -$eps ] && [ ! $actual_orientation = inverted ];then #check if the screen have to rotate
do_rotate inverted
fi
fi
sleep 1
done

exit 0

Second Part. Usually this is saved as {{path|/etc/acpid/x41t_control_gravity.sh}}

#!/bin/bash

#load configuration
. /etc/gravity/gravity.conf

################ set DISPLAY ####################
export DISPLAY=$Default_DISPLAY #a work around for right DISPLAY varialbe (I do not like it).
export XAUTHORITY=$Default_XAUTHORITY
xset -display $DISPLAY dpms

################# Main ##########################

if [ ! $1 ] || [ ! $1 = start ];then
killall x41t_gravity #return to normal state
xrandr -o normal
/usr/bin/xsetwacom set stylus rotate 0
rm /tmp/actual_orientation.txt
elif [ $1 = start ];then
#check for the kernel modul for gyroscope
lsmod | grep hdaps || modprobe hdaps
lsmod | grep hdaps || exit 1
(/etc/acpi/x41t_gravity)& #will be endless repeated (kill see up)
fi

exit 0

Some settings that have to tune. Usually this is saved as {{path|/etc/gravity/gravity.conf}}

x_horizontal=433 #horizontal position, get it by calibration
y_horizontal=390 #just read the value in /sys/devices/platform/hdaps/position
#the first value is x, second one is y

eps=40 #define a neighbourhood interpreted as horizontal

Default_DISPLAY=":0.0"
Default_XAUTHORITY=/home/smjb0803/.Xauthority

Now lets begin! Just add two ACPI events, first to start the ''x41t_gravity'', second for ending it.

Fist. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-down}}.
# /etc/acpi/events/x41t-swivel-down
# called when tablet head swivels down
event=ibm/hotkey HKEY 00000080 00005009
action=/etc/acpi/x41t_control_gravity.sh start

Second. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-up}}.
# /etc/acpi/events/x41t-swivel-up
# called when tablet head swivels up
event=ibm/hotkey HKEY 00000080 0000500a
action=/etc/acpi/x41t_control_gravity.sh stop

And restart the ACPID.
sudo /etc/init.d/acpid restart

That`s it. Have fun and make suggestions.
--[[User:Jonasbergel|Jonasbergel]] 09:27, 16 October 2008 (CEST)

How to rotate X41t screen with gravity sensor(hdaps)

2008-10-16T07:27:19Z

Jonasbergel: â†Created page with 'X41 TabletCategory:X41 Tablet The X41t has a acceleration sensor build in. Originally it can protect the hard drive, if Laptop is falling dow...'

[[:Category:X41 Tablet|X41 Tablet]][[Category:X41 Tablet]]

The X41t has a acceleration sensor build in. Originally it can protect the hard drive, if Laptop is falling down. See the [[HDAPS]] Page.
Now lets use that for funny stuff like emulate a joystick for Neverball [http://de.wikipedia.org/wiki/Neverball]. Or we use it for a very useful thing: Rotating the screen by recognizing where is downward. Like a lot of handy tools, like mobiles, mp3 player or photo cameras.

Basic concept is the following:
-Rotate the screen and the stylus to the steepest decent direction.
-Rotate only in stylus mode.
-Rotate only if it is really necessary.
-Rotate only if it cants more than 10 degrees.
-An easy program.

There are other programs witch can do that, but I have not found one that works out off the box. And I can not understand that much ''python''. So I tried it out myself.
I have written a set of small ''shell'' scripts that rotates the screen of the X41 Tablet by using the gravity sensor coordinates and some ACPI events.
It consist of two parts, fist the main part that contains the code for deciding and rotating and the second part which starts and stops the fist one. Maybe some one can make suggestions to get this in a real deamon style.

I have tested it on an x41t with ubuntu 8.04 with the standard kernel 2.6.24-19-generic.
''sudo apt-get install xset x11-xserver-utils wacom-tools'' should install all stuff.

First Part. Usually this is saved as {{path|/etc/acpid/x41t_gravity}}

#!/bin/bash

#usage: just start or kill it

#load configuration
. /etc/gravity/gravity.conf

get_orientation(){
string=`cat /sys/devices/platform/hdaps/position`
string=`echo $string | tr -d '[=-=][:blank:][=(=][=)=]'`
x=`echo $string | awk -v FS="," '{print $1}'`
y=`echo $string | awk -v FS="," '{print $2}'`
dx=`expr $x - $x_horizontal` #dx away from middle
dy=`expr $y - $y_horizontal` #dy away form the middle

#get actual orientation from last rotation, saved in a file :
if [ ! -f /tmp/actual_orientation.txt ];then
echo 0 > /tmp/actual_orientation.txt #0 means normal orientation
fi
actual_orientation=`cat /tmp/actual_orientation.txt`
}

prepare_rotate(){
echo "Nothing to prepare. I can rotate now."
#ps -A | grep compiz.real && (kwin --replace)& #because compiz sometimes crashes.
}

do_rotate(){
prepare_rotate
#rotate screen
xrandr -o $1
#rotate stylus
case $1 in
right)
/usr/bin/xsetwacom set stylus rotate 1;;
left)
/usr/bin/xsetwacom set stylus rotate 2;;
inverted)
/usr/bin/xsetwacom set stylus rotate 3;;
*)
/usr/bin/xsetwacom set stylus rotate 0;;
esac
#save the orientation
echo $1 > /tmp/actual_orientation.txt
}

######### Main ########################

while [ true ]; do
get_orientation
if [ `expr $dx \* $dx` -ge `expr $dy \* $dy` ];then #checks for the absolute greater value
if [ $dx -gt $eps ] && [ ! $actual_orientation = right ] ;then #check if the screen have to rotate
do_rotate right
elif [ $dx -lt -$eps ] && [ ! $actual_orientation = left ];then #check if the screen have to rotate
do_rotate left
fi
else
if [ $dy -gt $eps ] && [ ! $actual_orientation = normal ];then #check if the screen have to rotate
do_rotate normal
elif [ $dy -lt -$eps ] && [ ! $actual_orientation = inverted ];then #check if the screen have to rotate
do_rotate inverted
fi
fi
sleep 1
done

exit 0

Second Part. Usually this is saved as {{path|/etc/acpid/x41t_control_gravity.sh}}

#!/bin/bash

#load configuration
. /etc/gravity/gravity.conf

################ set DISPLAY ####################
export DISPLAY=$Default_DISPLAY #a work around for right DISPLAY varialbe (I do not like it).
export XAUTHORITY=$Default_XAUTHORITY
xset -display $DISPLAY dpms

################# Main ##########################

if [ ! $1 ] || [ ! $1 = start ];then
killall x41t_gravity #return to normal state
xrandr -o normal
/usr/bin/xsetwacom set stylus rotate 0
rm /tmp/actual_orientation.txt
elif [ $1 = start ];then
#check for the kernel modul for gyroscope
lsmod | grep hdaps || modprobe hdaps
lsmod | grep hdaps || exit 1
(/etc/acpi/x41t_gravity)& #will be endless repeated (kill see up)
fi

exit 0

Some settings that have to tune. Usually this is saved as {{path|/etc/gravity/gravity.conf}}

x_horizontal=433 #horizontal position, get it by calibration
y_horizontal=390 #just read the value in /sys/devices/platform/hdaps/position
#the first value is x, second one is y

eps=40 #define a neighbourhood interpreted as horizontal

Default_DISPLAY=":0.0"
Default_XAUTHORITY=/home/smjb0803/.Xauthority

Now lets begin! Just add two ACPI events, first to start the ''x41t_gravity'', second for ending it.

Fist. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-down}}.
# /etc/acpi/events/x41t-swivel-down
# called when tablet head swivels down
event=ibm/hotkey HKEY 00000080 00005009
action=/etc/acpi/x41t_control_gravity.sh start

Second. Usually this is saved as {{path|/etc/acpi/events/x41t-swivel-up}}.
# /etc/acpi/events/x41t-swivel-up
# called when tablet head swivels up
event=ibm/hotkey HKEY 00000080 0000500a
action=/etc/acpi/x41t_control_gravity.sh stop

And restart the ACPID.
sudo /etc/init.d/acpid restart

That`s it. Have fun and make suggestions.
--[[User:Jonasbergel|Jonasbergel]] 09:27, 16 October 2008 (CEST)