Well, that didn't work for very long. Disabling the acceleration of the
"intel" driver did not solve the problem for me. I tried three more
changes, described below.
(1) Next I tried going back to the "modesetting" driver but with the
acceleration disabled:
/etc/X11/xorg.conf
Section "Device"
Identifier "Intel Graphics"
Driver "modesetting"
Option "AccelMethod" "none"
EndSection
Eventually, the screen went into some kind of infinite-updating loop
among all the window and was completely unresponsive. The kernel log
file (/var/log/kern.log) contained the messages:
Apr 12 10:00:25 tower kernel: [ 4941.921796] show_signal_msg: 21 callbacks
suppressed
Apr 12 10:00:25 tower kernel: [ 4941.921808] GpuWatchdog[7196]: segfault at 0
ip 000055f89a514727 sp 00007f8ec6d966d0 error 6 in
signal-desktop[55f89733a000+53d7000]
I'm not sure whether the Signal desktop snap application triggered the
problem, but those were the last messages before having to power-off the
system.
(2) Next I removed the "/etc/X11/xorg.conf" file and reverted to the
original Ubuntu 16.04 kernel version 4.4 instead of the Hardware
Enablement (HWE) version 4.15. That eventually encountered the same
infinite-updating loop problem.
(3) So a couple of days ago I switched back to the HWE kernel version
4.15 and updated the Xorg configuration to use UXA instead of the
default SNA acceleration method. Several posts on the Internet suggested
that it might solve problems with Intel Skylake graphics. (I have Intel
HD Graphics P530 on a 2015 "Skylake" Xeon E3-1225v5 processor.)
/etc/X11/xorg.conf
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
# Acceleration method: Unified Acceleration Architecture
Option "AccelMethod" "UXA"
EndSection
So far, so good. It has been only a couple of days, though, and
sometimes the problem takes several days to occur.
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server-hwe-16.04 in Ubuntu.
https://bugs.launchpad.net/bugs/1724047
Title:
xserver terminates frequently, journal says drm/i915: Resetting chip
after gpu hang
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server-hwe-16.04/+bug/1724047/+subscriptions
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