LCD Brightness - Revision history

Ainscow: /* Nvidia driver */

2013-01-20T13:25:39Z

‎Nvidia driver

2011-07-11T05:25:47Z

Add info on nvidia binary driver brightness control option

2009-03-01T08:54:56Z

‎Ubuntu 8.10 Intrepid Ibex: x61 problems

2008-12-27T13:19:04Z

added suse info

2008-12-19T13:57:01Z

2008-12-03T19:37:09Z

2008-08-28T20:22:55Z

There are a lot more thinkpads than the T61...

2008-08-28T15:09:49Z

2008-08-16T23:17:07Z

2008-03-04T00:32:57Z

X61 link

@@ Line 75: / Line 75: @@
 == Nvidia driver ==
-A bug cropped up for some with recent nvidia driver causing brightness controls not to work (For example, on my W520 using the nvidia binary driver). The solution seems to be adding a flag to enable brightness control by the nvidia driver.
+The Nvidia driver does not enable Brightness Control by default. The solution is to add to the xorg.conf, using the xorg.conf.d mechanism:
    # Add to your "Device" section in /etc/X11/xorg.conf and restart X

← Older revision		Revision as of 05:25, 11 July 2011
Line 72:		Line 72:

	X61 appears to have some problems; the hardware keys for adjusting brightness are recognized, but they don't actually change the brightness. Setting xrandr to native, as described above, fixes the problem.		X61 appears to have some problems; the hardware keys for adjusting brightness are recognized, but they don't actually change the brightness. Setting xrandr to native, as described above, fixes the problem.
		+
		+	== Nvidia driver ==
		+
		+	A bug cropped up for some with recent nvidia driver causing brightness controls not to work (For example, on my W520 using the nvidia binary driver). The solution seems to be adding a flag to enable brightness control by the nvidia driver.
		+
		+	# Add to your "Device" section in /etc/X11/xorg.conf and restart X
		+	Option "RegistryDwords" "EnableBrightnessControl=1"
		+
		+	[https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/726692 Ubuntu Bug #726692]

← Older revision		Revision as of 08:54, 1 March 2009
Line 70:		Line 70:
	== Ubuntu 8.10 Intrepid Ibex ==		== Ubuntu 8.10 Intrepid Ibex ==
	The hardware keys work out of the box on a clean install of Ubuntu 8.10 Intrepid Ibex and openSUSE 11.1. No tweaking necessary.		The hardware keys work out of the box on a clean install of Ubuntu 8.10 Intrepid Ibex and openSUSE 11.1. No tweaking necessary.
		+
		+	X61 appears to have some problems; the hardware keys for adjusting brightness are recognized, but they don't actually change the brightness. Setting xrandr to native, as described above, fixes the problem.

← Older revision		Revision as of 13:19, 27 December 2008
Line 69:		Line 69:

	== Ubuntu 8.10 Intrepid Ibex ==		== Ubuntu 8.10 Intrepid Ibex ==
−	The hardware keys work out of the box on a clean install of Ubuntu 8.10 Intrepid Ibex. No tweaking necessary.	+	The hardware keys work out of the box on a clean install of Ubuntu 8.10 Intrepid Ibex and openSUSE 11.1. No tweaking necessary.

@@ Line 1: / Line 1: @@
 {{Stub}}
-== LCD Brightness ==
+== Regular ACPI ==
 This worked for my {{X61}}:
@@ Line 22: / Line 22: @@
   #!/bin/sh
   xbacklight -inc 10%
-== 2.6.26 kernel ==
+{{cmdroot|cat /sys/class/backlight/thinkpad_screen/actual_brightness}}
-If you are using a 2.6.26 kernel, you are supposed to use the regular ACPI backlight control instead of thinkpad-acpi, on any Lenovo (Windows Vista-capable) ThinkPad.
+Get the highest brightness level:
-Modify the kernel config by first disabling CONFIG_THINKPAD_ACPI_VIDEO and then enabling both CONFIG_VIDEO_OUTPUT_CONTROL and CONFIG_ACPI_VIDEO [http://www.nabble.com/T61-Brightness-keys-with-2.6.26-not-working-(NVIDIA)-td18577619.html]  While you are at it, be sure to read the well-written help sections for the kernel config settings :)
+{{cmdroot|echo 3 > /sys/class/backlight/thinkpad_screen/brightness}}
 == Ubuntu 8.10 Intrepid Ibex ==
 The hardware keys work out of the box on a clean install of Ubuntu 8.10 Intrepid Ibex.  No tweaking necessary.

← Older revision		Revision as of 19:37, 3 December 2008
Line 29:		Line 29:

	Modify the kernel config by first disabling CONFIG_THINKPAD_ACPI_VIDEO and then enabling both CONFIG_VIDEO_OUTPUT_CONTROL and CONFIG_ACPI_VIDEO [http://www.nabble.com/T61-Brightness-keys-with-2.6.26-not-working-(NVIDIA)-td18577619.html] While you are at it, be sure to read the well-written help sections for the kernel config settings :)		Modify the kernel config by first disabling CONFIG_THINKPAD_ACPI_VIDEO and then enabling both CONFIG_VIDEO_OUTPUT_CONTROL and CONFIG_ACPI_VIDEO [http://www.nabble.com/T61-Brightness-keys-with-2.6.26-not-working-(NVIDIA)-td18577619.html] While you are at it, be sure to read the well-written help sections for the kernel config settings :)
		+
		+	== Ubuntu 8.10 Intrepid Ibex ==
		+	The hardware keys work out of the box on a clean install of Ubuntu 8.10 Intrepid Ibex. No tweaking necessary.

← Older revision		Revision as of 15:09, 28 August 2008
Line 22:		Line 22:
	#!/bin/sh		#!/bin/sh
	xbacklight -inc 10%		xbacklight -inc 10%
		+
		+
		+	== 2.6.26 kernel ==
		+
		+	If you are using a 2.6.26 kernel, the backlight does not work with thinkpad-acpi.
		+
		+	Modify the kernel config by first disabling CONFIG_THINKPAD_ACPI_VIDEO and then enabling both CONFIG_VIDEO_OUTPUT_CONTROL and CONFIG_ACPI_VIDEO [http://www.nabble.com/T61-Brightness-keys-with-2.6.26-not-working-(NVIDIA)-td18577619.html] While you are at it, be sure to read the well-written help sections for the kernel config settings :)

← Older revision		Revision as of 23:17, 16 August 2008
Line 12:		Line 12:

	{{cmduser\|$xrandr --output LVDS --set BACKLIGHT_CONTROL native}}		{{cmduser\|$xrandr --output LVDS --set BACKLIGHT_CONTROL native}}
		+
		+	For my {{X61}}, these following scripts from [http://d.hatena.ne.jp/conceal-rs/20080309/1205083315 this japanese site] helped:
		+
		+	% cat /etc/acpi/video_brightnessdown.sh
		+	#!/bin/sh
		+	xbacklight -dec 10%
		+
		+	% cat /etc/acpi/video_brightnessup.sh
		+	#!/bin/sh
		+	xbacklight -inc 10%

@@ Line 3: / Line 3: @@
 == LCD Brightness ==
-This worked for my [[X61]]:
+This worked for my {{X61}}:
 Once your brightness keys work, you can set the brightness by writing to the procfs: