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  • Do you have some brightness-control-files in /sys/class/backlight/ or in /proc/acpi/? Commented Feb 12, 2013 at 20:33
  • Probably, you want this for eye problems? I managed to change the brightness on my Debian, but I have forgotten how (but it was the hardware keys) - anyway, I stopped all that and now exclusive use a projector (no TV, no devices) and my desktop looks like this - that's Emacs, but the shell looks the same (I use the Linux VTs/ttys/"console") - i.e., fullscreen (no swapping back and forth between windows, BLACK background, and LARGE font). Your problems may be less severe, but if they get worse, remember those things - they work. Commented Feb 13, 2013 at 1:25
  • Looks like there's simply no kernel / driver support for the specific model / chipset the P855 has. Commented Feb 13, 2013 at 10:05