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THE GENESIS

I have been using fglrx-updates - VESA:HONDO (AMD graphics drivers) for some time but Chrome GPU process kept crashing (it was sand-boxed). Therefore now I'm on xorg - Gallium 0.4 on AMD PALM drivers which very nicely proved to be friends with Chrome.

Actually this would interest everybody having these GPU crashes and for stability I recommend xorg instead of fglrx. No crashes at all :) .


THE PROBLEM

But now I can not set brightness level by using special fn function keys on my notebook. Ubuntu receives request and displays the change but that is strict formal. I don't know about other settings for that, so I'm always on full-eyes-melting-sun-level-brightness setting.

Ubuntu 14.04 x64 on HP 655
Processor: AMD E2-1800 APU
Graphics: Radeon HD 7340

EVEN MORE

Tried also fglrx build on my own Ubuntu, very long time spent on preparing, debugging etc.; finally get it to build and install but again had Chrome GPU process crashing...

What does not work:

  • edit /etc/X11/xorg.conf (adding Option "RegistryDwords") & reboot
  • change brightness via xbacklight -set x%
  • manage special keys via xdotool
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  • Now I'm confused because screen saver CAN fade the brightness from full to null, but fn keys can NOT while displaying the updated level of brittleness... – Esamo Oct 8 '14 at 21:18
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Finally this is what has worked

  1. Open / edit grub file sudo gedit /etc/default/grub.

  2. Find the option GRUB_CMDLINE_LINUX_DEFAULT.

  3. Comment that line (add # at the begginging) as a backup.

  4. Add below the new line containing our settings for brightness management:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"

  5. Save the file.

  6. Run at the terminal sudo update-grub which applies new settings for further system start-ups.

  7. Reboot & it's ready to go.


Yaaay! No more eyes melting for me...

Now I can adjust the screen brightness via special notebook fn keys.

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