It has locked up again overnight but I can still SSH in.
One possible thought is - could it be systemd-timesync which is the problem and
not actually xorg?
The Xorg.0.log shows nothing unusual but syslog and kern.log are full of
entries about CPU lockup, and "top" as always shows systemd-timesync as
the process hogging the CPU (xorg sometimes shows up hogging 100% of CPU
time in the "top" list, but systems-timesync ALWAYS does when I
experience a freeze:
top - 07:41:20 up 13:26, 2 users, load average: 10.00, 10.01, 9.98
Tasks: 262 total, 7 running, 252 sleeping, 0 stopped, 3 zombie
%Cpu(s): 0.0 us, 14.3 sy, 0.0 ni, 85.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 64276444 total, 46083912 free, 1240520 used, 16952012 buff/cache
KiB Swap: 65379324 total, 65379324 free, 0 used. 62810940 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
521 systemd+ 20 0 102384 2588 2352 R 100.0 0.0 727:17.66
systemd-timesyn
1 root 20 0 119860 6044 4008 D 0.0 0.0 0:01.07 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/0
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https://bugs.launchpad.net/bugs/1587730
Title:
graphic system freezes after a while, can still ssh into machine
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