[Bug 104343] ZaphodHeads + TearFree cause what looks like severe double buffering synchronization problems

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104343

--- Comment #2 from Werner Almesberger <werner at almesberger.net> ---
I compiled the driver from git, with

./autogen.sh --enable-debug=full --prefix=/usr
make
make install

The X server picks it up, but fails initialization with

to_sna:499 assertion 'sna->scrn == scrn' failed

Full log:
https://almesberger.net/paste/Xorg.0.log-Fae9oiPh.txt

Sadly, when trying to return to the configuration that worked before, I now
still get the problems I had initially. So this means that, either
1) that appearance of the problem is affected by other variables (and may not
have anything to do with TearFree)
2) make uninstall (of xserver-xorg-video-intel) left something behind,
3) apt-get removing and then re-installing the xserver-xorg-video-intel package
caused some change
3) I introduced a change when editing xorg.conf back and forth for testing the
driver compiled from git

Regarding 3), I checked in the log that TearFree is always disable. Regarding
1), I tried to repeat the sequence of configurations that led to the successful
run, in particular the configuration that disabled TearFree only in one case,
followed by the correct one, but that didn't help.

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