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Crash of X11 and after 0.5 to 2 seconds Ubuntu shutdown.

This appears randomly, the system journal says nothing at this moment
and there's no report in /var/crash

The .xsession-errors.old contains often the line: 
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
      after 33 requests (33 known processed) with 0 events remaining.
Gdk-Message: 01:16:44.392: mate-screensaver: Fatal IO error 11 (Ressource 
temporairement non disponible) on X server :0.

Note: mate-screensaver is just an example.

Configuration:
Ubuntu 18-04.3 LTS 64 bytes
Environment Mate

vincent@djoliba:~$ lspci
00:00.0 Host bridge: Intel Corporation 82Q963/Q965 Memory Controller Hub (rev 
02)
00:02.0 VGA compatible controller: Intel Corporation 82Q963/Q965 Integrated 
Graphics Controller (rev 02)
00:03.0 Communication controller: Intel Corporation 82Q963/Q965 HECI Controller 
(rev 02)
00:03.2 IDE interface: Intel Corporation 82Q963/Q965 PT IDER Controller (rev 02)
00:03.3 Serial controller: Intel Corporation 82Q963/Q965 KT Controller (rev 02)
00:19.0 Ethernet controller: Intel Corporation 82566DM Gigabit Network 
Connection (rev 02)
00:1a.0 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #4 (rev 02)
00:1a.7 USB controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI 
Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio 
Controller (rev 02)
00:1d.0 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #3 (rev 02)
00:1d.7 USB controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI 
Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev f2)
00:1f.0 ISA bridge: Intel Corporation 82801HO (ICH8DO) LPC Interface Controller 
(rev 02)
00:1f.2 IDE interface: Intel Corporation 82801H (ICH8 Family) 4 port SATA 
Controller [IDE mode] (rev 02)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02)
00:1f.5 IDE interface: Intel Corporation 82801HR/HO/HH (ICH8R/DO/DH) 2 port 
SATA Controller [IDE mode] (rev 02)

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: Incomplete

-- 
serverX crashes randomly
https://bugs.launchpad.net/bugs/1847222
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is subscribed to xorg-server in Ubuntu.

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