[mythtv-commits] Ticket #10839: V4L Tuner auto-standby causes recording to fail

MythTV noreply at mythtv.org
Sat Jun 16 20:15:02 UTC 2012

#10839: V4L Tuner auto-standby causes recording to fail
     Reporter:  dave@…                |      Owner:  danielk
         Type:  Bug Report - General  |     Status:  new
     Priority:  minor                 |  Milestone:  unknown
    Component:  MythTV - Recording    |    Version:  0.25
     Severity:  medium                |   Keywords:
Ticket locked:  0                     |
 Many USB capture devices power down the tuner when the last user closes
 the video device in order to save power. Unfortunately, MythTV seems to
 open the device for tuning, closes it, then re-opens it for recording.
 This sequence causes the Hauppauge HVR 850 (and likely others) to loose
 its tune, and we record a white screen.

 If I keep a user on the device by running 'sleep 365d <
 /dev/v4l/HVR850/video' in another window, I am able to capture video. (No
 sound, but that is a separate issue I've not looked into yet.)

 It is arguable that V4L should restore the previous tuner settings when
 waking it up, but handling this in MythTV should also marginally improve
 channel switching speeds.

Ticket URL: <http://code.mythtv.org/trac/ticket/10839>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center

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