[Bug 49789] External monitor flickers on xrandr or cat /sys/class/drm/card0-VGA-1/status

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49789

--- Comment #5 from Harald Judt <h.judt at gmx.at> 2012-05-15 02:01:59 PDT ---
(In reply to comment #4)
> (In reply to comment #3)
> > Can I somehow find out (log files, whatever), whether the monitor has an EDID
> > or not, after it has been connected? Because then I could turn off the polling
> > for the time being, or at least reduce the polling interval.
> > 
> 
> You can check the `xrandr --verbose` output.

Thanks, that will help.

> > With regard to the events: I've tried using udev to react to the hotplug
> > events, but it wouldn't work reliably. It would successfully recognize a
> > monitor the first time, but fail to trigger on disconnect or later connect
> > attempts. So unfortunately, my approach was and probably is the only
> > viable/reliable here to do it automatically.
> 
> What kernel are you using?  There were some problems with disconnects not
> getting detected in certain cases with that were fixed in 3.3 IIRC.

I've tried again with 3.4.0-rc7, but nothing changed. This is on a different
system though, so I filed another bug #49943.

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