[Bug 105811] kernel 4.15.x boot fails at kms

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105811

--- Comment #28 from Alec Habig <ahabig at umn.edu> ---
Interesting development here.  I decided to try the latest drm-tip (4.17.0-rc4)
and see what happens.  It died: but looking at it harder, it seems my working
drm-tip (4.16.0-rc7) had a much simpler .config file.  I think the difference
is I compiled the new one as root, which picked up all the config settings from
my currently running fedora 4.14 kernel, while doing it as a normal user for
4.16 did not.

Anyway - copying over the 4.16 .config into the 4.17 build area, and being
conservative with all the new config optins the 4.17 build presents, it does
boot again: although it does spend 30+seconds at the boot flailing: before
succeeding rather than failing.

So: something in fedora's kernel config is triggering my problem.  So I can try
bisecting kernel options till I find the specific troublemaker.  There are a
lot of them though.

But: it's not just that.  Hopefully the additional debugging info in the 4.17
dmesg (attached) offer clues.  You can see the drm module having problems: I do
not know the severity of the problems, just that it did the same "spend 30-odd
seconds early in the boot timing out" problem as it does when it fails,even
though it then succeeds (with a simpler .config).

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