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[Launchpad Bug Tracker <585498@xxxxxxxxxxxxxxxxxx>]

You have been subscribed to a public bug:

After starting another X session by swicthing users, attempting to
switch back to the first gives a blank screen.  If the switch is done
using Ctrl+Alt+F7 I can switch to the new user again with Ctrl+Alt+F8;
but if I try to switch back using the user switch applet I can't (i.e.
both VT7 and VT8 show and blank screen).  if I log out of the new user's
session, all VTs are blank (incluing 1-6).  I can log in using ssh and
restating gdm gets everything back to normal.

This seems to be closely realted (but not identical) to some other bugs.
The closest being 546578 but (a) I am not using ATI hardware and (b) the
problem is not there when KMS is off (i.e. booting with i915.modeset=0
fixes the problem).  Just as in 546578, entering a password blind and
running xgamma -gamma 1.0 also get the VT back to normal.  After this
switching back and forth works fine.

I suspect this is just http://bugs.freedesktop.org/show_bug.cgi?id=27382
in another guise but it seems worth reporting.

** Affects: xserver-xorg-video-intel
     Importance: Undecided
         Status: New

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Blank screen after user switching on Intel hw and with KMS on
https://bugs.launchpad.net/bugs/585498
You received this bug notification because you are a member of Ubuntu-X, which is the registrant for xf86-video-intel.