[Bug 49688] [GM965/GL960] blank screen after switching between VGA1 and LVDS1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49688

--- Comment #40 from max <manikulin at gmail.com> ---
Created attachment 76343
  --> https://bugs.freedesktop.org/attachment.cgi?id=76343&action=edit
dmesg, drm.debug=0xe, black LVDS1

drm-intel-nightly kernel 2013-03-07
3.8.0-994-generic #201303070438 SMP Thu Mar 7 09:47:22 UTC 2013 i686 i686 i686
GNU/Linux

As usual, no problem in Ubuntu Unity session.
With "startx /usr/bin/xterm" external monitor (VGA1) is always dark
after switching, however it is waked up from power saving mode.
First switching back to internal screen (LVDS1) leads to dark screen,
after next one normal picture is shown.

The only difference in dmesg with drm.debug=0x0e just after switching
to LVDS1 is the following line
dark screen:
[  165.792214] [drm:i9xx_update_plane], Writing base 00832000 00000000 0 0 5120
normal image:
[  372.664238] [drm:i9xx_update_plane], Writing base 01042000 00000000 0 0 5120
Note 00832000 vs. 01042000

As usual, I have to press [Ctrl+Alt+F1], [Alt+F7] to bring the image back.

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