We have a laptop here with a Intel 915 that gives the same message.
Attempting to use Xrandr just results in a segmentation fault if the
monitor is plugged in.
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[GM45, 945] Unable to mirror to external monitor
https://bugs.launchpad.net/bugs/368518
You received this bug notification because you
I'll try to get a backtrace as soon as possible.
I'd just thought I'd mention though that it turns out that this defect
(and the segfault in Xrandr) only happens on one monitor I have - I
tried another (newer) monitor and two projectors and it worked fine
there.
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[GM45, 945] Unable to mirror t