From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 49789] External monitor flickers on xrandr or cat
/sys/class/drm/card0-VGA-1/status
Date: Fri, 11 May 2012 14:50:48 +0000
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https://bugs.freedesktop.org/show_bug.cgi?id=49789
Alex Deucher changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |NOTABUG
--- Comment #2 from Alex Deucher 2012-05-11 07:50:48 PDT ---
The driver uses load detection to see if a monitor is connected if it does not
provide an EDID. The process of detecting load on the pins will cause a
momentary distortion of the image in some cases. There's not much else you can
do if you want to be able to detect the presence or lack of a monitor without
an EDID. BTW, for monitors with an EDID the driver will automatically generate
events when they are connected or disconnected so there is no need to poll.
Unfortunately, load detection is the only option for analog monitors that have
no EDID. Digital monitors will generate a hotplug interrupt.
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