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
https://bugs.freedesktop.org/show_bug.cgi?id=47007
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: http://paste.ubuntu.com/1030913/
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.
Regards
greg
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