ThinkWiki - User contributions [en]

Problem with LCD backlight remaining on during ACPI sleep

2006-10-27T21:36:42Z

Pete: /* Using Powersaved */ orthography

==Problem description==
On some models the LCD backlight remains on during ACPI sleep.

==Affected Models==
*ThinkPad {{390X}} with kernel boot option ACPI=force
*ThinkPad {{A30}}
*ThinkPad {{A31p}}
*ThinkPad {{T30}}
*ThinkPad {{X31}},{{X32}}
*ThinkPad {{R51}}
(according to the relevant bug on the Kernel bug tracker ([http://bugzilla.kernel.org/show_bug.cgi?id=2576 bug 2576]))

==Partial solution==
If the ThinkPad has a radeon video chip, then switching off the light with the command
radeontool light off
will work, but only in a text-mode virtual terminal. If X is running, the light apparently comes back on when the kernel switches to text mode prior to sleeping. The solution in that case it to switch to a text mode console first.

logger "Software suspend to ram."
FGCONSOLE=`fgconsole`
chvt 1
radeontool light off
echo -n 3 >/proc/acpi/sleep
logger "Woke up from suspend."
radeontool light on
chvt $FGCONSOLE

Improvements are clearly possible. :-)

On the X32, at least, the bios will switch off the screen by default on a lid close, and suspending to ram interrupts this, and the screen will turn back on. This can be fixed by simply adding "sleep 5" before "echo -n 3 > /proc/acpi/sleep". The suspend will take longer, but the screen will remain off.

A similar script can be found on the [[How to configure acpid|acpid configuration HOWTO]] page.

==Using Powersaved==

If you use powersaved you can just edit the two scripts prepare_suspend_to_ram and restore_after_suspend_to_ram which are stored in /usr/lib/powersave/scripts/

add two lines to prepare_suspend_to_ram nearly at the end of the script:

# insert the next two lines:
chvt 1
radeontool light off
# this changes to a console nr. 1 and switches the light off

progress_finish
$SCRIPT_RETURN $EV_ID 0 "prepare_sleep finished successfully for $1"
EXIT 0

and to restore_after_suspend_to_ram
# insert the next two lines:
radeontool light on
chvt 7
# this switching the light on and changes to display #7 (where the x-server runs) -
#you can change it to another display if you want...
#(the way doing this with a variable like in the script above doesn't work, because it can't be stored between
#the two different scripts.

# $SCRIPT_RETURN is called in restore_after_sleep.
EXIT 0

Than you can suspend to ram with /usr/bin/powersave -u or just configure powersaved in a way that it suspends to ram when your notebook is closed. (As a frontend kpowersave is recomended).

Problem with LCD backlight remaining on during ACPI sleep

2006-06-28T16:11:48Z

Pete: /* Using Powersaved */

==Problem description==
On some models the LCD backlight remains on during ACPI sleep.

==Affected Models==
*ThinkPad {{390X}} with kernel boot option ACPI=force
*ThinkPad {{A30}}
*ThinkPad {{A31p}}
*ThinkPad {{T30}}
*ThinkPad {{X31}},{{X32}}
*ThinkPad {{R51}}
(according to the relevant bug on the Kernel bug tracker ([http://bugzilla.kernel.org/show_bug.cgi?id=2576 bug 2576]))

==Partial solution==
If the ThinkPad has a radeon video chip, then switching off the light with the command
radeontool light off
will work, but only in a text-mode virtual terminal. If X is running, the light apparently comes back on when the kernel switches to text mode prior to sleeping. The solution in that case it to switch to a text mode console first.

logger "Software suspend to ram."
FGCONSOLE=`fgconsole`
chvt 1
radeontool light off
echo -n 3 >/proc/acpi/sleep
logger "Woke up from suspend."
radeontool light on
chvt $FGCONSOLE

Improvements are clearly possible. :-)

On the X32, at least, the bios will switch off the screen by default on a lid close, and suspending to ram interrupts this, and the screen will turn back on. This can be fixed by simply adding "sleep 5" before "echo -n 3 > /proc/acpi/sleep". The suspend will take longer, but the screen will remain off.

A similar script can be found on the [[How to configure acpid|acpid configuration HOWTO]] page.

==Using Powersaved==

If you use posersaved you can just edit the two scripts prepare_suspend_to_ram and restore_after_suspend_to_ram which are stored in /usr/lib/powersave/scripts/

add two lines to prepare_suspend_to_ram nearly at the end of the script:

# insert the next two lines:
chvt 1
radeontool light off
# this changes to a console nr. 1 and switches the light off

progress_finish
$SCRIPT_RETURN $EV_ID 0 "prepare_sleep finished successfully for $1"
EXIT 0

and to restore_after_suspend_to_ram
# insert the next two lines:
radeontool light on
chvt 7
# this switching the light on and changes to display #7 (where the x-server runs) -
#you can change it to another display if you want...
#(the way doing this with a variable like in the script above doesn't work, because it can't be stored between
#the two different scripts.

# $SCRIPT_RETURN is called in restore_after_sleep.
EXIT 0

Than you can suspend to ram with /usr/bin/powersave -u or just configure powersaved in a way that it suspends to ram when your notebook is closed. (As a frontend kpowersave is recomended).

Problem with LCD backlight remaining on during ACPI sleep

2006-06-28T15:58:07Z

Pete: /* Partial solution */

==Problem description==
On some models the LCD backlight remains on during ACPI sleep.

==Affected Models==
*ThinkPad {{390X}} with kernel boot option ACPI=force
*ThinkPad {{A30}}
*ThinkPad {{A31p}}
*ThinkPad {{T30}}
*ThinkPad {{X31}},{{X32}}
*ThinkPad {{R51}}
(according to the relevant bug on the Kernel bug tracker ([http://bugzilla.kernel.org/show_bug.cgi?id=2576 bug 2576]))

==Partial solution==
If the ThinkPad has a radeon video chip, then switching off the light with the command
radeontool light off
will work, but only in a text-mode virtual terminal. If X is running, the light apparently comes back on when the kernel switches to text mode prior to sleeping. The solution in that case it to switch to a text mode console first.

logger "Software suspend to ram."
FGCONSOLE=`fgconsole`
chvt 1
radeontool light off
echo -n 3 >/proc/acpi/sleep
logger "Woke up from suspend."
radeontool light on
chvt $FGCONSOLE

Improvements are clearly possible. :-)

On the X32, at least, the bios will switch off the screen by default on a lid close, and suspending to ram interrupts this, and the screen will turn back on. This can be fixed by simply adding "sleep 5" before "echo -n 3 > /proc/acpi/sleep". The suspend will take longer, but the screen will remain off.

A similar script can be found on the [[How to configure acpid|acpid configuration HOWTO]] page.

==Using Powersaved==

If you use posersaved you can just edit the two scripts prepare_suspend_to_ram and restore_after_suspend_to_ram which are stored in /usr/lib/powersave/scripts/

add two lines to prepare_suspend_to_ram nearly at the end of the script:

# insert the next two lines:
chvt 1
radeontool light off
# this changes to a console nr. 1 and switches the light off

progress_finish
$SCRIPT_RETURN $EV_ID 0 "prepare_sleep finished successfully for $1"
EXIT 0

and to restore_after_suspend_to_ram
# insert the next two lines:
radeontool light on
chvt 7
# this switching the light on and changes to display #7 (where the x-server runs) -
#you can change it to another display if you want...
#(the way doing this with a variable like in the script above doesn't work, because it can't be stored between
#the two different scripts.

# $SCRIPT_RETURN is called in restore_after_sleep.
EXIT 0