Bug 88781

Summary: black screen when starting X with radeon
Product: Drivers Reporter: serge (serge.yquel)
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: NEW ---    
Severity: blocking CC: szg00000
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 3.17.3 Subsystem:
Regression: No Bisected commit-id:

Description serge 2014-11-23 16:59:58 UTC 
Hello,

Since the 3.17.3 kernel when starting X,I got a black screen with no tty acces,with stable mesa or mesa-git.

If i switch to catalyst,all is fine,also after downgrading the kernel to 3.17.2 i can start X with mesa drivers.

I did a git bisect and the result is:



ffe0245532b98efc4bc0e06f29c51d3f0e471152 is the first bad commit
commit ffe0245532b98efc4bc0e06f29c51d3f0e471152
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Mon Oct 13 11:51:50 2014 -0400

    drm/radeon: fix speaker allocation setup
    
    commit 4910403836ded89803fab201d4b5caaa85de3a89 upstream.
    
    If the sad_count is 0, set the hw to stereo and change
    the error message to a warn.  A lot of monitors don't
    set the speaker allocation block.
    
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

:040000 040000 e74a4921582bc648dac6568df703f3a857a121d7 c99bee9a0eab114373fb523803be6e7c4c6cf218 M	drivers
Comment 1 serge 2014-11-23 17:15:33 UTC 
I forgot to mention that it is happening with an HD6950,which is plugged by hdmi to an audio receiver which is connected to my tv.
Comment 2 Michel Dänzer 2014-11-25 02:57:24 UTC 
Duplicate of bug 88481.