Solution for flicker issue on linux kernel >2.6.38

Discussions about Linux installation and configuration on Samsung laptops
flipreverse
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Joined: 22/05/2011, 13:04

Solution for flicker issue on linux kernel >2.6.38

Postby flipreverse » 22/05/2011, 13:27

Hi everybody!

I've got a solution for that flicker issue on a linux kernel newer than 2.6.38.

My system:
- Samsung N220 Plus Marvell
- Installed linux kernel 2.6.38 or newer
- Installed voira modules

Problem:
- the os tries to reduce the display brightness
---> the display starts to flicker

Solution:
Since 2.6.38 der kernel maintainer moved the samsung laptop driver from the staging tree to the main tree. Normally the kernel prefers modules from the main tree. i think he doesn't load driver from the staging tree except you force him to do so. As a result the kernel prefers loading this module instead of the voria module (samsung_backlight called).
The samsung_laptop seems not be as good as the voira one.
Now let explain me the solution:

1. edit the "/etc/modprobe.d/blacklist.conf":
at the end add this line: blacklist samsung_laptop

2. edit "/etc/default/grub/" (if you are using grub 2):
search the line with GRUB_CMDLINE_LINUX_DEFAULT=. add the following to the string: acpi_backlight=vendor

3. execute update-grub

4. reboot your os

Greeting
fLiP

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