I am using Ubuntu 20.04 on Dell vostro 7500. But the whole system crash frequently. The symptom is the screen shows no response to keyboard event and mouse event(mouse cannot move or click), but the screen is still light and showing the graphic contents(but everything including the time is stuck).
SysRq+REISUB, which works in normal time on my machine, is invalid when crashing. And
/var/log/syslog contains nothing after the crash. So it should be a kernel crash. Does anybody encounter this problem ever? I have reported this on launchpad https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1909381. Please vote on it if you also share the same problem.
After the crash, I updated my BIOS and fully tested my hardware and found no hardware error. Switching my kernel from
5.4.0-58-generic back to
5.4.0-42-generic also does not solve this problem.
I searched the contents in
syslog just before the crash, but I found no much similar pattern. But the following line appears before both of the two crashes:
Dec 22 19:09:12 ofSimon kernel: [ 878.796035] sof-audio-pci 0000:00:1f.3: error: no reply expected, received 0x0
I do not know what it means, and I noticed that this line also appear in
tty every time when I shutdown my computer. Can anyone explain it to me?