[arch-general] thinkpad t61 and not able to adjust brightness

[Michael Schaefer]

I've similar problem here with my X60s.

echo 'up' >! /proc/acpi/ibm/brightness

works fine but using the hotkeys has no effect. I now realized that xev
doesn't return a keycode for FN+HOME and FN+END at all. FN only gives a
keycode as well as HOME and END on its own do.

However, i'm using Vanilla, so don't expect this to be an arch related
problem. AFAIK things concerning brightness adjustment changed for
2.6.29 in the acpi/video branch.

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9e6dada9d255497127251c03aaa59296d186f959

did anyone solve the problem?

regards - Michael


On 17.04.2009 04:13, Adam Stokes wrote:
> So pressing the fn home/end for brightness alters :
> 
> /proc/acpi/video/VID/LCD0/brightness
> 
> doing an:
> 
> echo '100' >/proc/acpi/video/VID/LCD0/brightness
> 
> My .config for the kernel is set to:
> 
> CONFIG_THINKPAD_ACPI_VIDEO=y
> CONFIG_VIDEO_OUTPUT_CONTROL=m
> CONFIG_ACPI_VIDEO=m
> 
> lsmod shows:
> 
> thinkpad_acpi          70316  0
> rfkill                 11444  4 iwl3945,thinkpad_acpi
> led_class               4344  3 iwl3945,sdhci,thinkpad_acpi
> nvram                   7868  1 thinkpad_acpi
> 
> dmesg shows:
> thinkpad_acpi: ThinkPad ACPI Extras v0.22
> thinkpad_acpi: http://ibm-acpi.sf.net/
> thinkpad_acpi: ThinkPad BIOS 7LETA7WW (2.07 ), EC 7KHT24WW-1.08
> thinkpad_acpi: Lenovo ThinkPad T61, model 6464Y1E
> thinkpad_acpi: ACPI backlight control delay disabled
> thinkpad_acpi: radio switch found; radios are enabled
> thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness
> control, supported by the ACPI video driver
> thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
> thinkpad_acpi: Standard ACPI backlight interface available, not
> loading native one.
> 
> kernel is 2.6.29-ARCH
> 
> anyone know why the brightness still refuses to work?
>