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I have ASUS 1015CX Netbook on which I have installed Ubuntu 12.04LTS. All seem to work fine however there is an issue with brightness settings; changing the brightness (both through settings and with hotkeys) has no effect.

However once I log off or power down the screen brightness drops to minimal level. I have to log in and out again for the brightness to increase.

How can I fix this?

  • Can you add the outputs of ls /sys/class/backlight and cat /sys/class/backlight/*/brightness to the question. have you installed the proprietary CedarView driver? ASUS 1015CX specs. – mikewhatever Apr 7 '13 at 7:00
  • @mikewhatever ls /sys/class/backlight: acpi_video0 psb-bl cat/sys/class/backlight/*/brightness: 9 100 – Jakub Apr 7 '13 at 10:28
  • No I did not install the CedarView driver. Where can I get this? – Jakub Apr 7 '13 at 20:00
  • You can get it from the Additional Drivers, with three pre-conditions: 32bit OS, 3.2 kernel and 1.11 xorg version. – mikewhatever Apr 7 '13 at 21:27
  • Nothing appears in the Additional Drivers section, is there a way to get it manually then? – Jakub Apr 9 '13 at 17:24
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This is hardly convenient, but when this happens to me, I run:

sudo pm-suspend

And then wake the machine again. It comes back with full brightness!

That might be preferable to logging out and in again. ;)

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