[Bug 40252] No udev event for disconnecting VGA/HDMI cable

https://bugs.freedesktop.org/show_bug.cgi?id=40252

--- Comment #3 from Alex Deucher agd5f@yahoo.com 2011-09-22 13:17:45 PDT --- (In reply to comment #2)

I've got a similar problem with a Mobility Radeon HD 4300 Series card, there is no change recognized on connect and disconnect.

Any hint where to look?

Hotplug interrupts only work for digital displays (TMDS/DP). Analog displays require polling.

Check your dmesg output and make sure there is an HPD pin assigned to the digital display connector you are trying to use. It's also possible your OEM did not wire up the pin properly.