[mythtv-commits] Ticket #6561: video sync using DRM vblank on VIA cn400 hardware is broken starting with the 2.6.28 kernel.

MythTV mythtv at cvs.mythtv.org
Tue May 19 14:59:33 UTC 2009


#6561: video sync using DRM vblank on VIA cn400 hardware is broken starting with
the 2.6.28 kernel.
-------------------------------------+--------------------------------------
 Reporter:  pebender at san.rr.com      |       Owner:  ijr       
     Type:  defect                   |      Status:  new       
 Priority:  minor                    |   Milestone:  unknown   
Component:  MythTV - Video Playback  |     Version:  0.21-fixes
 Severity:  low                      |     Mlocked:  0         
-------------------------------------+--------------------------------------
 It appears that changes in the DRM code introduced in the 2.6.28 kernel
 broke video sync using DRM vblank on VIA cn400 hardware. By default, with
 the 2.6.28.10, 2.6.29.3 and 2.6.30-rc6 kernels, video playback on my VIA
 SP8000E is completely unwatchable due to stutters and stalls. However, if
 I disable the use of DRM vblank either by renaming /dev/dri/card0 (using
 udev rules) or by commenting out the DRM video sync test in
 mythtv/libs/libmythtv/vsync.cpp, then MythTV uses usleep and everything
 works fine.

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/6561>
MythTV <http://www.mythtv.org/>
MythTV


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