Nevermind, I used a thinkpad t470s plus an external ssd which I could
wipe out and install ubuntu mate 18.04 32bit on it. To reproduce I
enabled the HWE ppa and upgraded mesa, then installed linux-generic and
booted 4.15.0-55. It ended up with a mostly blank screen but keyboard
had no effect other than the power button.
Then I installed 'linux-image-4.15.0-56-generic linux-
modules-4.15.0-56-generic linux-modules-extra-4.15.0-56-generic' and
rebooted, and now I got to the display manager normally.
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
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which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1815172
Title:
[bionic] drm/i915: softpin broken, needs to be fixed for 32bit mesa
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