Bisecting is a manual process, since it's some option (or combination
thereof) enabled in Fedora's .config that's the problem rather than a
bad commit which git can help with.
You're right in that it's not drm-tip itself. In fact, while the
original weirdness manifested itself in drm, it also
nuts. Going to 4.20.15-200.fc29.x86_64 failed again... and backing up
to 4.20.13-200 also failed. Tricked by a race condition into thinking
that that version actually worked? Bad interaction with some other
update applied since? Dunno.
drm-tip (now at 5.1-rc3) continues to work.
Fedora 29 is
Just accidentally booted into fedora's 4.20.13-200.fc29.x86_64 (have
been happily running the drm-tip)... and it worked!
Will try reading changelogs to get some clues.
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Sorry for the long silence. Going has been slow: it takes a while to do
a tweak/test/reboot/hang cycle. Especially since the disk controller
gets munged upon the bug happening, even persisting across a power cycle
(!) about 50% of the time (I have no idea how such a thing is even
possible).
ok, all's not wine and roses. When exiting X, it goes into the same
style lockup as used to happen on boot. Which includes crashing so hard
that often times (but not all the time) the BIOS can't find the boot
disk after the next power cycle.
At least the bug moving further back in the chain
So since last week, kernel-4.18.7-100.fc27.x86_64 came out on the Fedora
updates repo. Tried it just now in the process of looking at the next
batch of options differences... and it didn't crash! And all the other
drivers I need on this laptop are enabled (which wasn't the case with
your drm-tip
I do: even with the current Fedora Kernel (4.17.19) and the latest
Lenovo BIOS (which got updated recently, presumably for spectre
mitigation). Just verified this when booting this morning (accidentally
chose the wrong kernel in grub).
I have made little progress on narrowing down which kernel
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