Did a bisect on the drm i915 driver, came up with no root cause.
Did a full bisect between 4.18 and 4.20, bisected down to a PTI commit:
7757d607c6b31867777de42e1fb0210b9c5d8b70 is the first bad commit
commit 7757d607c6b31867777de42e1fb0210b9c5d8b70
Author: Joerg Roedel <jroe...@suse.de>
Date: Wed Jul 18 11:41:14 2018 +0200
x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32
Allow PTI to be compiled on x86_32.
This seems to make sense, it's x86_32 specific and explains the more
random nature of the crashes.
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https://bugs.launchpad.net/bugs/1838115
Title:
linux hwe i386 kernel 5.0.0-21.22~18.04.1 crashes on Lenovo x220
Status in linux package in Ubuntu:
Incomplete
Bug description:
Installed Bionic 18.04.2 i386 Desktop (using xubuntu) on a Lenovo
x220i and upgraded to proposed. The 5.0.0.22 kernel crashes in various
ways with video corruption being a main visible featured.
The CPU is a i3-2350M CPU, a 64 bit capable CPU, being booted with
EUFI firmware disabled, so using traditional BIOS.
1. Crashes can be just complete hangs, no ability to switch virtual console
2. Crashes may just result in screen turning off, no video and hang and/or
reboot
3. Crashes sometimes allow virtual console. Can see watchdog hang checks
appearing on 1 or more CPUs.
Tried the i386 https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D
kernels:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.21/ - same issue
https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.20.17/ - same issue
https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19.61/ - OK
We therefore can conclude:
1. Issue appears between 4.19.61 and 4.20.17
2. Issue is in upstream kernel
3. Issue not a kernel patch per-se (e.g. security fix, ubuntu sauce patch,
etc)
I repeated this with a VM installation and I don't see the issue, so
this probably is a hardware (or firmware?) specific issue.
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