https://bugs.freedesktop.org/show_bug.cgi?id=49943
--- Comment #4 from Harald Judt h.judt@gmx.at 2012-06-14 15:14:51 PDT --- Ok, tried again with 3.4.0 final.
First, no HDMI monitor connected:
Evergreen HDMI regs: 0x601c 0x00000000 (0) 0x6028 0x050ff012 (84930578) 0x6034 0x00000012 (18) 0x6040 0x00000000 (0) 0x604c 0x00000000 (0) 0x6058 0x00000000 (0)
Connecting HDMI monitor:
udevadm monitor --property monitor will print the received events for: UDEV - the event which udev sends out after rule processing KERNEL - the kernel uevent
KERNEL[115260.630569] change /devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 (drm) ACTION=change DEVNAME=/dev/dri/card0 DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 DEVTYPE=drm_minor HOTPLUG=1 MAJOR=226 MINOR=0 SEQNUM=1815 SUBSYSTEM=drm
UDEV [115260.638205] change /devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 (drm) ACTION=change DEVNAME=/dev/dri/card0 DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 DEVTYPE=drm_minor HOTPLUG=1 MAJOR=226 MINOR=0 SEQNUM=1815 SUBSYSTEM=drm USEC_INITIALIZED=115260630528
Evergreen HDMI regs: 0x601c 0x00000000 (0) 0x6028 0x050ff012 (84930578) 0x6034 0x00000012 (18) 0x6040 0x00000000 (0) 0x604c 0x00000000 (0) 0x6058 0xff000012 (-16777198)
Disconnecting HDMI monitor:
<< No events reported by udevadm >>
Evergreen HDMI regs: 0x601c 0x00000000 (0) 0x6028 0x050ff012 (84930578) 0x6034 0x00000012 (18) 0x6040 0x00000000 (0) 0x604c 0x00000000 (0) 0x6058 0xff0ff000 (-15732736)
Nothing improved, event notification still doesn't work :-(