[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

Alex Deucher <agd5f at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |NOTABUG

--- Comment #2 from Alex Deucher <agd5f at yahoo.com> 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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