[Bug 207613] New: Won't boot

[Bug 207613] New: Won't boot

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207613

            Bug ID: 207613
           Summary: Won't boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.7.0.994
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: mfox@trentu.ca
        Regression: No

Created attachment 288979
  --> https://bugzilla.kernel.org/attachment.cgi?id=288979&action=edit
dmesg from 5.7.0.994 boot attempt

Applies to a 2015 5k iMac 27" with AMD r9390x video card. I was asked to file
this as I have been testing 5.3, 5.4, 5.6 and 5.7 kernel, all of which boot
very slowly (> 3 minutes to working desktop), and also have delayed wakeup from
display sleep (~2 minutes) and delayed shutdown (~ 2 minutes). dmesg and
systemd analysis for these boots have been posted in
bugs.launchpad.net/bugs/1875211.

I have been asked to test several of the 5.7 rc kernels and the latest version
(5.7.0.994). Only one of these versions would boot at all (rc3); the other rc
kernels would only get as far as the login screen, and 5.7.0.994 wouldn't get
even that far. Attached is the dmesg to the 5.7.0.994 boot attempt.

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[Bug 207613] Won't boot

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207613

Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher (alexdeucher@gmail.com) ---
Did this system ever work?  If so when and can you bisect?

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[Bug 207613] Won't boot

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207613

--- Comment #2 from Michael Fox (mfox@trentu.ca) ---
(In reply to Alex Deucher from comment #1)
> Did this system ever work?  If so when and can you bisect?

Yes, it works well with the 4.15 kernel. And I did bisect to the extent of
finding out the point at which the slow boot occurred. You can follow it here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874104

In a nutshell, kernels 5.0, 5.1 and 5.2 are fine. The last good (i.e. normal
booting) kernel was 5.2.21. Kernel 5.3.rc1 was the first slow booting version.
Kernels I tried that are slow booting are 5.3.0, 5.3.1, 5.6, and the 5.6 rc's
leading up to 5.7.0.994. I don't think I am technically competent enough to
dissect within a kernel.

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