OpenGL video performance

Greg G. dargllun at
Fri Jun 8 12:22:56 PDT 2012

On 08.06.2012 15:29, Alex Deucher wrote:
>> 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.

Here you go:

I understand polling is required for the VGA port, but I don't really 
care for that one. I just verified it: once .../poll is set to N, HDMI 
hotplug via udev SUBSYSTEM=="drm", ACTION=="change" doesn't trigger anymore.

Let me know if you need anymore input.


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