Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free.

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?

share|improve this question
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

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.