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View Full Version : [ubuntu] Found the problem: laptop brightness fail



biji
October 31st, 2011, 04:57 PM
Hi,
after a little console hacking, i found the cause of my laptop (old lenovo laptop) brightness problem. There are two backlight interface control in /sys:


ls /sys/class/backlight/
ideapad
intel_backlight


have tried to echo 7 > brightness, the one works is ideapad. but intel_backlight only give max_brightness to 1. And... the system use it as backlight control. Is there any to disable intel_backlight, or maybe force using ideapad??

Thanks

biji
November 15th, 2011, 09:37 AM
Hmmm no body has this problem too?
Do you know how to disable intel_backlight from loading?

thx

awolff
December 5th, 2011, 10:00 PM
The kernel from following PPA solved the problem on my lenovo S10e and 11.10:
https://launchpad.net/~kamalmostafa/+archive/stuck-backlight

I still have the kernel parameter acpi_backlight=vendor