Talk:Problem with LCD brightness buttons - Revision history

Caioromao: /* Problem with LCD brightness buttons after suspend-to-ram */

2008-10-04T18:18:37Z

‎Problem with LCD brightness buttons after suspend-to-ram

Caioromao at 18:18, 4 October 2008

2008-10-04T18:18:12Z

Kavehmz: New section: VID vs VID simple solution

2008-09-24T23:51:20Z

New section: VID vs VID simple solution

Mm1: /* Problem with LCD brightness buttons after suspend-to-ram */

2008-06-12T13:48:08Z

‎Problem with LCD brightness buttons after suspend-to-ram

Marijn: half a solution (for my case) and another question

2008-05-09T18:31:55Z

half a solution (for my case) and another question

WilliamPoetra: /* Problem with LCD brightness buttons after suspend-to-ram */

2007-10-13T17:08:50Z

‎Problem with LCD brightness buttons after suspend-to-ram

WilliamPoetra: /* Problem with LCD brightness buttons after suspend-to-ram */

2007-10-13T07:43:16Z

‎Problem with LCD brightness buttons after suspend-to-ram

Ghorvath at 05:50, 18 July 2007

2007-07-18T05:50:56Z

Jzxu: Can't change brightness on T61

2007-07-04T19:06:58Z

Can't change brightness on T61

WilliamPoetra at 03:01, 25 March 2007

2007-03-25T03:01:05Z

New page

== Problem with LCD brightness buttons after suspend-to-ram ==

On my X60 1706-BM7, it's possible to suspend-to-ram either using s2ram or just "echo mem > /sys/power/state". There's a problem I've noticed, that after I resumed the machine, the LCD brightness buttons take longer to respond. Symptoms are:
*Before suspending, whenever I press the LCD brightness up/down keys, the screen promptly respond by dimming or brighten up.
*After resuming, whenever I press the same keys again, it takes about 1 sec. for the screen to dim or brighten up.
*After resuming, if I use the command "echo down > /proc/acpi/ibm/brightness" or "echo up > /proc/acpi/ibm/brightness", the screen will respond right away, just like before suspending.
*Without suspending, using "vbetool post" doesn't give this behaviour.
So I think this problem is related to the buttons itself. Does anyone have a similar experience? Any solutions? --[[User:WilliamPoetra|WilliamPoetra]] 10:55, 25 March 2007 (CST)

@@ Line 14: / Line 14: @@
 Edit: I have the same Problem on my T61.
-Edit: The same is happening to me: R61 773-1ES ([[User:caioromao|Caio Romão]])
+Edit: The same is happening to me: R61 7733-1ES ([[User:caioromao|Caio Romão]])
 == Can't change brightness on T61 ==

← Older revision		Revision as of 18:18, 4 October 2008
Line 13:		Line 13:

	Edit: I have the same Problem on my T61.		Edit: I have the same Problem on my T61.
		+
		+	Edit: The same is happening to me: R61 773-1ES ([[User:caioromao\|Caio Romão]])

	== Can't change brightness on T61 ==		== Can't change brightness on T61 ==

← Older revision		Revision as of 23:51, 24 September 2008
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	This might or might not be related to the above problems, but on my T61 (intel video) using Debian Lenny, the fn-home and fn-end keys do not change the screen brightness. Some digging around shows that these keys do change /proc/acpi/video/VID/LCD0/brightness, which does not appear to affect the screen at all, while manually sending something to /proc/acpi/video/VID1/LCD1/brightness (note the 1 after VID) does have an effect on the screen. Now my problem remains figuring out how to configure these keys to work. I'm not even sure which piece of software is controlling them at this point. Any hints?		This might or might not be related to the above problems, but on my T61 (intel video) using Debian Lenny, the fn-home and fn-end keys do not change the screen brightness. Some digging around shows that these keys do change /proc/acpi/video/VID/LCD0/brightness, which does not appear to affect the screen at all, while manually sending something to /proc/acpi/video/VID1/LCD1/brightness (note the 1 after VID) does have an effect on the screen. Now my problem remains figuring out how to configure these keys to work. I'm not even sure which piece of software is controlling them at this point. Any hints?
		+
		+	== VID vs VID simple solution ==
		+
		+	There is a simple solution for T61 computers that by default Fn+Home/End hot-keys will change /proc/acpi/video/VID/LCD0/brightness instead of VID1 that controls LCD.
		+
		+	For now you can add a file, named (optional, you can name it anything) "brightness_controll" to /etc/acpi/events and add these two lines into it
		+
		+	event=video LCD0
		+	action=echo `cat /proc/acpi/video/VID/LCD0/brightness\|grep current\|cut -f 2 -d " " ` > /proc/acpi/video/VID1/LCD0/brightness
		+
		+	It will on event of LCD0 brightness change copy the brightness value LCD0 from VID to VID1. It will do the just for now.

← Older revision		Revision as of 13:48, 12 June 2008
Line 11:		Line 11:

	Edit: Nope, the problem doesn't go away.		Edit: Nope, the problem doesn't go away.
		+
		+	Edit: I have the same Problem on my T61.

	== Can't change brightness on T61 ==		== Can't change brightness on T61 ==

← Older revision		Revision as of 18:31, 9 May 2008
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	Any suggestions?		Any suggestions?
		+
		+	== VID vs VID1 ==
		+
		+	This might or might not be related to the above problems, but on my T61 (intel video) using Debian Lenny, the fn-home and fn-end keys do not change the screen brightness. Some digging around shows that these keys do change /proc/acpi/video/VID/LCD0/brightness, which does not appear to affect the screen at all, while manually sending something to /proc/acpi/video/VID1/LCD1/brightness (note the 1 after VID) does have an effect on the screen. Now my problem remains figuring out how to configure these keys to work. I'm not even sure which piece of software is controlling them at this point. Any hints?

← Older revision		Revision as of 17:08, 13 October 2007
Line 9:		Line 9:

	Edit: According to Sebastian Schmidt, the delay goes away with BIOS 2.11 [http://mailman.linux-thinkpad.org/pipermail/linux-thinkpad/2007-July/039586.html]. I'll check it out.		Edit: According to Sebastian Schmidt, the delay goes away with BIOS 2.11 [http://mailman.linux-thinkpad.org/pipermail/linux-thinkpad/2007-July/039586.html]. I'll check it out.
		+
		+	Edit: Nope, the problem doesn't go away.

	== Can't change brightness on T61 ==		== Can't change brightness on T61 ==

@@ Line 7: / Line 7: @@
 *Without suspending, using "vbetool post" doesn't give this behaviour.
 So I think this problem is related to the buttons itself. Does anyone have a similar experience? Any solutions? --[[User:WilliamPoetra|WilliamPoetra]] 10:55, 25 March 2007 (CST)
 == Can't change brightness on T61 ==

← Older revision		Revision as of 05:50, 18 July 2007
Line 1:		Line 1:
−
	== Problem with LCD brightness buttons after suspend-to-ram ==		== Problem with LCD brightness buttons after suspend-to-ram ==

Line 12:		Line 11:

	I'm using a T61 with linux kernel 2.6.21-5 and thinkpad-acpi module v.0.14. For the life of me I can't manage to change the LCD brightness. I've tried using both the thinkpad-acpi method under /proc/acpi/ibm/brightness and also the kernel acpi video method under /proc/acpi/video/VID/LCD0/brightness, but neither works. Nor do the Fn-Home and Fn-End keys work themselves.		I'm using a T61 with linux kernel 2.6.21-5 and thinkpad-acpi module v.0.14. For the life of me I can't manage to change the LCD brightness. I've tried using both the thinkpad-acpi method under /proc/acpi/ibm/brightness and also the kernel acpi video method under /proc/acpi/video/VID/LCD0/brightness, but neither works. Nor do the Fn-Home and Fn-End keys work themselves.
		+
		+	== X Reboot after changing brightness beyond limit X60 ==
		+
		+	I am running Ubuntu Feisty
		+	$ uname -r
		+	2.6.20-16-generic
		+	on an X60 1706-85G
		+	BIOS update is from May 2007
		+
		+	After pressing the brightness up or down keys serveral times and passing the max low/high brightness limits the X server reboots:
		+
		+	$ tail /var/log/syslog
		+	Jul 18 07:23:11 brasov gdm[6387]: gdm_slave_xioerror_handler: Schwerwiegender X-Fehler - :0 wird neu gestartet
		+
		+	When I rmmod the video module as suggested the brightness keys do not work at all.
		+
		+	In the Ubuntu boot splash screen the brightness keys work normally.
		+
		+	Any suggestions?

← Older revision		Revision as of 19:06, 4 July 2007
Line 8:		Line 8:
	*Without suspending, using "vbetool post" doesn't give this behaviour.		*Without suspending, using "vbetool post" doesn't give this behaviour.
	So I think this problem is related to the buttons itself. Does anyone have a similar experience? Any solutions? --[[User:WilliamPoetra\|WilliamPoetra]] 10:55, 25 March 2007 (CST)		So I think this problem is related to the buttons itself. Does anyone have a similar experience? Any solutions? --[[User:WilliamPoetra\|WilliamPoetra]] 10:55, 25 March 2007 (CST)
		+
		+	== Can't change brightness on T61 ==
		+
		+	I'm using a T61 with linux kernel 2.6.21-5 and thinkpad-acpi module v.0.14. For the life of me I can't manage to change the LCD brightness. I've tried using both the thinkpad-acpi method under /proc/acpi/ibm/brightness and also the kernel acpi video method under /proc/acpi/video/VID/LCD0/brightness, but neither works. Nor do the Fn-Home and Fn-End keys work themselves.