[Bug 209417] New: kernel-5.8*, amdgpu - Blank screen shortly after boot, "fixed" with suspend and wake up

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=209417

            Bug ID: 209417
           Summary: kernel-5.8*, amdgpu - Blank screen shortly after boot,
                    "fixed" with suspend and wake up
           Product: Drivers
           Version: 2.5
    Kernel Version: >=5.8
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: juantxorena at gmail.com
        Regression: No

Created attachment 292699
  --> https://bugzilla.kernel.org/attachment.cgi?id=292699&action=edit
boot log 5.8.11 fedora

When using a 5.8.* kernel, the following happens:

- During boot, some initial messages appear, then the screen flickers a couple
of times and it goes blank

- I blind-enter the LUKS password, and it appears to work because

- pressing the sleep key of the keyboard (laptop) works and the laptop suspends

- after waking it up, it works normally

This happens with the normal boot options and without options "rhgb" and
"quiet". The problem goes away when using the "nomodeset" option in the kernel.

Hardware: Dell Precision 7530 laptop, Radeon Pro WX 4150 and integrated GPU
Intel UHD Graphics 630.

I have tried this with fedora kernels (the distro I use), and also with an
OpenSUSE live USB with a kernel 5.8.10. The problem persists, and the "fix" is
the same.

I attach the kernel log of a boot with the 5.8.11 kernel.

Extra information: I have had some problems with suspend, after suspending the
screen is blank and I have to close the lid and open again. This happens since
various kernels ago, but I never reported because it wasn't serious and I use
hibernate anyway. It may be related, since it works after suspend-wake up.

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