[Bug 207613] New: Won't boot

[bugzilla-daemon at bugzilla.kernel.org]

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 at kernel-bugs.osdl.org
          Reporter: mfox at 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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