When I "echo 20 > /proc/acpi/video/VID/LCD0/brightness" as root, the
contents of /proc/acpi/video/VID/LCD0/brightness update, but the screen
brightness does not. There is a delay before the bash prompt comes
back, comparable to the delay after hitting the Fn-key combo to change
brightness.
I have to do the above "echo" command as root ("sudo su -" then the
echo). Using "sudo echo ..." is not enough, as it tells me permission
denied.
Thank you for your help on this!
File contents and requested output below.
In /etc/modprobe.d/options I added the line and then rebooted:
options thinkpad_acpi brightness_enable=1
Under proc:
hca...@fry:/proc/acpi/video/VID$ cat LCD0/brightness
levels: 100 100 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100
current: 100
Output of 'grep -r . /proc/acpi/video':
/proc/acpi/video/VID/DVI0/EDID:<not supported>
/proc/acpi/video/VID/DVI0/brightness:<not supported>
/proc/acpi/video/VID/DVI0/state:state: 0x1d
/proc/acpi/video/VID/DVI0/state:query: 0x00
/proc/acpi/video/VID/DVI0/info:device_id: 0x0300
/proc/acpi/video/VID/DVI0/info:type: UNKNOWN
/proc/acpi/video/VID/DVI0/info:known by bios: no
/proc/acpi/video/VID/CRT0/EDID:<not supported>
/proc/acpi/video/VID/CRT0/brightness:<not supported>
/proc/acpi/video/VID/CRT0/state:state: 0x0d
/proc/acpi/video/VID/CRT0/state:query: 0x00
/proc/acpi/video/VID/CRT0/info:device_id: 0x0100
/proc/acpi/video/VID/CRT0/info:type: UNKNOWN
/proc/acpi/video/VID/CRT0/info:known by bios: no
/proc/acpi/video/VID/LCD0/EDID:<not supported>
/proc/acpi/video/VID/LCD0/brightness:levels: 100 100 20 25 30 35 40 45 50 55
60 65 70 75 80 85 90 100
/proc/acpi/video/VID/LCD0/brightness:current: 100
/proc/acpi/video/VID/LCD0/state:state: 0x1f
/proc/acpi/video/VID/LCD0/state:query: 0x01
/proc/acpi/video/VID/LCD0/info:device_id: 0x0400
/proc/acpi/video/VID/LCD0/info:type: UNKNOWN
/proc/acpi/video/VID/LCD0/info:known by bios: no
/proc/acpi/video/VID/DOS:DOS setting: <7>
/proc/acpi/video/VID/POST:<not supported>
/proc/acpi/video/VID/POST_info:<not supported>
/proc/acpi/video/VID/ROM:<TODO>
/proc/acpi/video/VID/info:Switching heads: yes
/proc/acpi/video/VID/info:Video ROM: no
/proc/acpi/video/VID/info:Device to be POSTed on boot: no
--
the brightness applet and function key do not work on my thinkpad x61s
https://bugs.launchpad.net/bugs/324061
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