Here's some system information to start with:
Linux mint 12 32-bit
Graphics card info from command lspci:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
Graphics card driver info from command inxi -Gx
Graphics: Card: Intel 2nd Generation Core Processor Family Integrated Graphics Controller bus-ID: 00:02.0
GLX Renderer: Mesa DRI Intel Sandybridge Desktop
GLX Version 2.1: Mesa 7.11.2
Direct Rendering: Yes
Could anyone help me with this. I'm attempting to reduce the brightness on my machine to a bearable level. I've got compiz installed and have adjusted the brightness using compiz, but there are still some windows that I can't adjust with compiz, so I'm going to have to adjust the brightness output of the system. Getting blinded by the url autocomplete is not fun.
I tried the command:
setpci -s 00:02.0 F4.B=50
this didn't work, I got the following error:
pcilib: Cannot open /sys/bus/pci/devices/0000:00:02.0/config
I've assumed that issuing the boot command 'acpi_osi=Linux' won't work as this seems to be a solution for laptops, to get the hotkeys working to adjust the brightness. I'm using a desktop machine so I don't have any function keys.
I looked into writing echo values to 'sys/class/backlight'. (as in this post: http://unix.stackexchange.com/questions ... after-boot
) I had a look at the 'sys/class/backlight' folder on my machine and it is empty. Why haven't I got anything in 'sys/class/backlight'?
Does anyone have any ideas how I can solve this?