[Bug 61457] [Intel G45] Screen turns blank when terminating a low res X server on a different low res KMS mode.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61457

--- Comment #1 from Egbert Eich <eich at pdx.freedesktop.org> ---
Created attachment 75526
  --> https://bugs.freedesktop.org/attachment.cgi?id=75526&action=edit
Ugly workaround.

After a long debugging session I came to the conclusion that this issue was
related to the hardware cursor plane being disabled when enabling the display
plane.
I tried several workarounds, the one attached is the simplest.
I would like to put it up for discussion as it contains an ugly and totally
not-understood delay which was determined experimentally.
It seems that the only way to avoid this problem is to wait for a vblank and
then add an delay of about 8-15 milliseconds.
It turned out that a shorter or longer delay let the problem reoccur.

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