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

[Sergey Manucharian]

On Thu, 16 Apr 2009 22:13:15 -0400
Adam Stokes <adam.stokes at gmail.com> 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?
> 

Hi Adam,

I'm using brightness control buttons every day with my ThinkPad
R61. Both

 echo '100' >/proc/acpi/video/VID/LCD0/brightness
 echo 15 > /sys/class/backlight/acpi_video0/brightness

work for me. 
"xev" shows the following:

 keycode 233 (keysym 0x1008ff02, XF86MonBrightnessUp)
 keycode 232 (keysym 0x1008ff03, XF86MonBrightnessDown)

I've updated the system yesterday, but brightness control works fine
for long time. I used to use custom scripts
launched from /etc/acpi/handler.sh long time ago since the the regular
buttons did not work properly.

You may want to add: 

 keycode 233 = XF86MonBrightnessUp
 keycode 232 = XF86MonBrightnessDown

to your ~/.Xmodmap file (though I haven't, but check with "xev")

Cheers,
Sergey