<div dir="ltr">I have discovered that this is caused by a kernel bug - <a href="https://bugzilla.kernel.org/show_bug.cgi?id=74861">https://bugzilla.kernel.org/show_bug.cgi?id=74861</a>. Adding <span style="color:rgb(0,0,0);white-space:pre-wrap">i915.disable_power_well=0 to the kernel boot line solves the issue, or presumably upgrading to 3.16.</span><div><span style="color:rgb(0,0,0);white-space:pre-wrap"><br></span></div><div><span style="color:rgb(0,0,0);white-space:pre-wrap">Sorry for the noise, but I hope this helps someone else out.</span></div><div><span style="color:rgb(0,0,0);white-space:pre-wrap"><br></span></div><div><span style="color:rgb(0,0,0);white-space:pre-wrap">Andrew</span></div><div><span style="color:rgb(0,0,0);white-space:pre-wrap"><br></span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 12, 2014 at 5:39 PM, Andrew Wilkinson <span dir="ltr"><<a href="mailto:andrewjwilkinson@gmail.com" target="_blank">andrewjwilkinson@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Further investigations into this issue reveal that if I set the audio output to NULL then the video plays at 25fps as it should. Obviously the lack of sound is a bit of problem...<div><br></div><div>This leads me to think that there is some issue with ALSA and my Onkyo amp. As I mentioned before everything works fine if the TV and amp are on before the computer boots, but there is an issue if they are switched on later (e.g. if it is recording).</div><div><br></div><div>Any suggestions gratefully received.</div><div><br></div><div>Regards,</div><div>Andrew</div><div><br></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 11, 2014 at 7:08 PM, Andrew Wilkinson <span dir="ltr"><<a href="mailto:andrewjwilkinson@gmail.com" target="_blank">andrewjwilkinson@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I'm using the inbuilt Intel graphics card using vaapi. It's got to be a settings issue because it works fine provided the tv is turned on before it boots.<span><font color="#888888"><div><br></div></font></span><div><span><font color="#888888">Andrew</font></span><div><div><br><div><br>On Tuesday, 11 November 2014, Peter Bennett (cats22) <<a href="mailto:cats22@comcast.net" target="_blank">cats22@comcast.net</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>On 11/10/2014 04:38 AM, Andrew
Wilkinson wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr"><span style="font-family:arial,sans-serif;font-size:12.7272720336914px">Hi,</span>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">Since
upgrading from Mythbuntu 12.04 to 14.04 I've had the issue
where if booted without the tv being on then there is no
signal when the tv is switched on. I've resolved the issue by
disabling xfsettingsd and running a script that calls xrandr
on hdmi connect. There is one remaining issue, and that's that
after my script uses xrandr to turn on the screen MythTV plays
all recordings at 30fps, making the sound higher pitched than
usual. If the tv is on when the machine is booted the
recordings play at 25 fps as usual.</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">Here
is the xrandr output when the TV was on when booted:</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">
<div>Screen 0: minimum 320 x 200, current 1360 x 768, maximum
32767 x 32767</div>
<div>VGA1 disconnected (normal left inverted right x axis y
axis)</div>
<div>HDMI1 disconnected (normal left inverted right x axis y
axis)</div>
<div>HDMI2 connected 1360x768+0+0 (normal left inverted right
x axis y axis) 160mm x 90mm</div>
<div> 1360x768 60.0*+</div>
<div> 1920x1080i 60.1 50.0 60.0 </div>
<div> 1280x720 60.0 50.0 59.9 </div>
<div> 1024x768 60.0 </div>
<div> 800x600 60.3 </div>
<div> 720x576 50.0 </div>
<div> 720x480 60.0 59.9 </div>
<div> 640x480 60.0 59.9 </div>
<div> 720x400 70.1 </div>
<div>VIRTUAL1 disconnected (normal left inverted right x axis
y axis)</div>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">And
here's the start of the frontend log with -v playback, also
when the TV was on when booted.</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div><font face="arial, sans-serif"><a href="http://pastebin.com/A1DMTgqN" target="_blank">http://pastebin.com/A1DMTgqN</a></font><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">Here
is the xrandr output from when the TV was turned off when the
machine booted:</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">
<div>Screen 0: minimum 320 x 200, current 1360 x 768, maximum
32767 x 32767</div>
<div>VGA1 disconnected (normal left inverted right x axis y
axis)</div>
<div>HDMI1 disconnected (normal left inverted right x axis y
axis)</div>
<div>HDMI2 connected 1360x768+0+0 (normal left inverted right
x axis y axis) 160mm x 90mm</div>
<div> 1920x1080i 60.1 + 50.0 60.0 </div>
<div> 1360x768 60.0*+</div>
<div> 1280x720 60.0 50.0 59.9 </div>
<div> 1440x576 50.0 </div>
<div> 1024x768 60.0 </div>
<div> 1440x480 60.0 59.9 </div>
<div> 800x600 60.3 </div>
<div> 720x576 50.0 </div>
<div> 720x480 60.0 59.9 </div>
<div> 640x480 60.0 59.9 </div>
<div> 720x400 70.1 </div>
<div>VIRTUAL1 disconnected (normal left inverted right x axis
y axis)</div>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">And
here's the log with -v playback from when TV was off during
boot.</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div><font face="arial, sans-serif"><a href="http://pastebin.com/wBxuCP2M" target="_blank">http://pastebin.com/wBxuCP2M</a></font><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">As
you can see in the second of these log outputs it is playing
the video at 30fps, but earlier it correctly detects that the
video is 25fps. Why? What can I do to get it to play at the
correct speed?</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">Many
thanks,</div>
<div style="font-family:arial,sans-serif;font-size:12.7272720336914px">Andrew</div>
</div>
<br>
<fieldset></fieldset>
<br>
</blockquote>
What video adapter do you have?<br>
I have had problems in the past of recordings playing at the wrong
speed. I switched to an NVidia display adapter and use vdpau and
have not had the problem since. I use the $20 Nvidia GeForce 210.<br>
<br>
Peter<br>
<br>
</div>
</blockquote></div></div></div></div>
</blockquote></div><br></div>
</div></div></blockquote></div><br></div>