[Bug 49943] radeon/drm: Hotplug udev events stop working

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49943

--- Comment #5 from Alex Deucher <agd5f at yahoo.com> 2012-06-14 15:20:27 PDT ---
Can you see if the hw is still generating interrupts?  Enable drm debugging
(boot with drm.debug=1 on the kernel command line in grub or as root:
echo 1 > /sys/module/drm/parameters/debug
Then plug and unplug your monitor and check your dmesg output.  You should see
HPD messages each time you plug or unplug.  I'd suggest doing this without X
running otherwise there will be too much other stuff in your dmesg output.

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