[mythtv-commits] Ticket #11729: video play double speed (too fast), audio plays normal speed, nouveau driver only

[MythTV]

#11729: video play double speed (too fast), audio plays normal speed, nouveau
driver only
---------------------------------------------+-------------------------
 Reporter:  Trevor Cordes <mythtv@…>         |          Owner:
     Type:  Bug Report - General             |         Status:  new
 Priority:  minor                            |      Milestone:  unknown
Component:  MythTV - Video Playback          |        Version:  0.26
 Severity:  medium                           |     Resolution:
 Keywords:  video double speed audio normal  |  Ticket locked:  0
---------------------------------------------+-------------------------

Comment (by Cédric Schieli <cschieli@…>):

 This is definitely a kernel bug. It was introduced in commit 0fa9061ae8c
 and will be fixed in 3.14 (commit 7d3428cd4b2). The patch has also been
 queued for stable kernel branches 3.10 and 3.13.

 Due to this bug, the calls to DRM_IOCTL_WAIT_VBLANK in libmythtv/vsync.cpp
 were returning immediately, resulting in the anormal speed.

 I've patched my 3.11 Ubuntu kernel with  drm-nouveau-set-irq_enabled-
 manually.patch and everything work smoothly here.
 Alternately it is possible to workaround the problem by patching MythTV to
 skip DRM VSYNC timing : workaround.patch

--
Ticket URL: <https://code.mythtv.org/trac/ticket/11729#comment:24>
MythTV <http://www.mythtv.org>
MythTV Media Center