Brightness control on a Panasonic Toughbook CF-M34

synthead · 2009-02-12 22:21:42

The function keys don't work so I went to investigate. I found /proc/acpi/video/GRFX/LCD1/brightness, but when I run cat brightness, it says <not supported>. This is on an Intel graphics adapter that reads "Intel Corporation 82830 CGC [Chipset Graphics Controller] (rev 04)" by lspci. I an using the "intel" xorg driver.

synthead · 2009-11-26 05:53:08

Any thoughts? Thought I'd dig this up since I'm getting really into my Toughbook now

JackH79 · 2009-11-26 06:30:03

Have you tried:

xbacklight -set 80

(replace "80" with whichever value (0-100).
If it works, use keybinds to change values, if needed, or, if one value is good enough, put in autostart.

synthead · 2009-12-04 18:43:07

Here's what I get:

[max@coppertop ~]$ xbacklight
No outputs have backlight property

rent0n · 2009-12-04 18:49:57

Try looking for something related to brightness in /sys/class/backlight/acpi_video/ or /sys/devices/virtual/backlight/acpi_video.
If you find files named brightness, look at them and change their value with:

echo $value | sudo tee brightness

If this approach fails, try to append acpi_backlight=vendor to your kernel line in /boot/grub/menu.lst, reboot and then try your brightness keys.

Arch Linux

#1 2009-02-12 22:21:42

Brightness control on a Panasonic Toughbook CF-M34

#2 2009-11-26 05:53:08

Re: Brightness control on a Panasonic Toughbook CF-M34

#3 2009-11-26 06:30:03

Re: Brightness control on a Panasonic Toughbook CF-M34

#4 2009-12-04 18:43:07

Re: Brightness control on a Panasonic Toughbook CF-M34

#5 2009-12-04 18:49:57

Re: Brightness control on a Panasonic Toughbook CF-M34

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