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X crashes in stretch

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Hi,
after upgrading to sretch, no graphics work anymore.  The upgrade brought in  
systemd-sysv instead of sysvinit-core, which I had in jessie.  I don't know  
which other packages, if any, went that route...

Gdm3 wasn't even able to display anything readable.  It worked well in  
jessie.  In stretch, its screen was fubar as if an img with the wrong
width was splashed to the graphic memory.  Changing to lightdm looks
better.  However, X crashes after logging in.

I tried reinstalling and reconfiguring a number of packages, to no avail.

I logged in on the tty and issued startx twice.  The first time I tried to  
open a terminal:  a terminal window opened momentarily, the background  
disappeared, and then I was back to text mode.  The second time I opened  
gnome-chess, played a few moves and closed the chess window.  Dmesg reported:

[Sep10 12:49] gnome-shell[25411]: segfault at 88feb010 ip 00007f519a31fca3  
sp 00007ffd7d23bb80 error 4

However, X didn't crash.  I reopened gnome-chess and closed, and this time  
crashed.  I don't attach X logs, as they are longish.  I coped them here:
http://www.tana.it/Xorg.xterm.log
http://www.tana.it/Xorg.gnome-chess.log
The few dmesg lines relative to each session are appended at the bottom of  
each log.

Can someone please help me fix this pc, anyhow?  I have no idea how to  
proceed.  Even reassuring that working settings exist will help.

Thank you
Ale

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X crashes in stretch Alessandro Vesely <vesely@tana.it> - 2017-09-10 13:40 +0200
  Re: X crashes in stretch (hint: kernel) Alessandro Vesely <vesely@tana.it> - 2017-09-10 18:30 +0200

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