triggering xrandr from VGA plug event - intel 965GM

Eric Anholt eric at
Fri Jul 6 10:47:09 PDT 2007

On Fri, 2007-07-06 at 18:00 +1200, Martin Langhoff wrote:
> When I plug an external monitor to the VGA port of the i965GM, should
> there be a dbus or udev event? Or some other event? I want to be able
> to trigger xrandr --auto on monitor unplug, and xrandr --output VGA
> --right-of LVDS --auto on monitor plug.
>        In other words - MacOSX has been a bad influence  ;-)
> Neither dbus-monitor (which I think should show hal events?) nor
> udev-monitor show anything. kern.log doesn't hear of it.

There is some hardware capability to help us out with detecting hotplug
events, but on pre-945, we would require polling to detect at least some
outputs, and in particular VGA.  I believe Keith is planning on hooking
up the non-polling pieces some time soon and checking the power
consumption effects of doing so.

Eric Anholt                             anholt at
eric at                         eric.anholt at

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