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

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri May 11 10:23:56 PDT 2012


--- Comment #4 from Alex Deucher <agd5f at yahoo.com> 2012-05-11 10:23:56 PDT ---
(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.

> 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.

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