Bug 43207

Summary:	radeon driver on HD6570 shows pixel noise
Product:	Drivers	Reporter:	Vladislav Tcendrovskii (ccvs)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	alan, alexdeucher, florian
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.*	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	screenshot of problem dmesg Xorg log screenshot Fix backend map

Description Vladislav Tcendrovskii 2012-05-05 08:59:21 UTC

Videocard HD6570.

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

Comment 1 Vladislav Tcendrovskii 2012-05-05 09:07:30 UTC

Created attachment 73191 [details]
screenshot of problem

Comment 2 Alex Deucher 2012-05-11 14:54:27 UTC

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.

Comment 3 Alex Deucher 2012-05-11 14:56:18 UTC

This is a duplicate of:
https://bugs.freedesktop.org/show_bug.cgi?id=49792

Comment 4 Vladislav Tcendrovskii 2012-05-11 20:21:01 UTC

Created attachment 73252 [details]
dmesg

Comment 5 Vladislav Tcendrovskii 2012-05-11 20:21:21 UTC

Created attachment 73253 [details]
Xorg log

Comment 6 Vladislav Tcendrovskii 2012-05-11 20:34:02 UTC

Created attachment 73254 [details]
screenshot

Comment 7 Vladislav Tcendrovskii 2012-05-24 16:30:46 UTC

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.

Comment 8 Jérôme Glisse 2012-05-24 19:13:23 UTC

Created attachment 73382 [details]
Fix backend map

This patch should fix your issue

Comment 9 Vladislav Tcendrovskii 2012-05-25 20:10:06 UTC

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.

Comment 10 Florian Mickler 2012-07-01 09:50:02 UTC

A patch referencing this bug report has been merged in Linux v3.5-rc1:

commit 95c4b23ec4e2fa5604df229ddf134e31d7b3b378
Author: Jerome Glisse <jglisse@redhat.com>
Date:   Thu May 31 19:00:24 2012 -0400

    drm/radeon: fix HD6790, HD6570 backend programming