Kernel Bug Tracker – Bug 43207
radeon driver on HD6570 shows pixel noise
Last modified: 2012-08-15 22:00:50 UTC
when I call "modprobe radeon", I see pixel noise on the screen and, if try more, it's possible to see some characters from framebuffer console.
dmesg shows, that firmware loads right
without firmware module loads, but it's useless, besause X driver needs KMS, which is disabled without firmware
Created attachment 73191 [details]
screenshot of problem
Please attach your xorg log and dmesg. Also, please attach your screenshot rather and providing a link to a hosting site that may go away.
This is a duplicate of:
Created attachment 73252 [details]
Created attachment 73253 [details]
Created attachment 73254 [details]
I have tested kernel 3.4.
Results look a bit strange:
When i use modprobe radeon, I have the same pixel noise, which I had before.
If I start X, I have screen with windows and noise.
When I return to console, noise disappers.
If I return to X, it also works fine.
Created attachment 73382 [details]
Fix backend map
This patch should fix your issue
I've tried this patch on kernel 3.4, but the only visible result - switching from noisy X screen to framebuffer console is much faster.
After such switching noise disappears.
A patch referencing this bug report has been merged in Linux v3.5-rc1:
Author: Jerome Glisse <email@example.com>
Date: Thu May 31 19:00:24 2012 -0400
drm/radeon: fix HD6790, HD6570 backend programming