OpenGL video performance

Alex Deucher alexdeucher at
Fri Jun 8 06:29:03 PDT 2012

On Fri, Jun 8, 2012 at 8:26 AM, Greg G. <dargllun at> wrote:
> On 25.04.2012 18:34, Greg G. wrote:
>> Background: for some time now I've repeatedly trying to get my HD3200
>> equipped mythtv box to use the OpenGL renderer. While things have gotten
>> *much* better in the course of the last 1.5 years, I still find that Xv
>> rendering is much more "real-time", meaning that when I use a proper
>> deinterlacer (hard requirement) with Xv I get smooth rendering with no
>> judder at all. WithOpenGL it's pretty jerky. My test case is to play
>> some piece of recording from a news channel with a horizontal scoll text
>> (like stock prices), this way you see even slight hickups. Note I'm not
>> even talking about h.264 output (which is, btw, also great on Xv), but
>> merely SD material.
> I have now found out that I seem to be a victim of this bug:
> [Bug 47007] HDMI monitor polling causing 100ms rendering stalls
> When I 'echo N >/sys/module/drm_kms_helper/parameters/poll' things get
> MUCH better!
> However, now the HDMI hotplug doesn't work anymore. My HW is a RS780 on
> Gigabyte GA-MA78GM-UD2H mainboard. As far as I understand the bug's
> audit trail, what I observe would indicate that the manufacturer didn't
> connect the hotplug pin properly. Is there anything else I can try to
> disable polling and still have HDMI hotplug? I really need that, because
> when my AVR is off, there is no EDID and thus I can't launch X. So
> whenever I turn the AVR on/off, my X session will follow.

Post your dmesg output.  The polling is for your VGA port most likely
since analog generally doesn't support hotplug.


> --
> Regards
> greg
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