1. Please describe the problem:
After upgrade to kernel 5.13.4-200, following display manager (either gdm or sddm) system shows black screen with intermittent white flashes.  This happens when trying to use either Wayland GNOME or Wayland Plasma.  Does not occur when using X11. 


2. What is the Version-Release number of the kernel:  5.13.4-200


3. Did it work previously in Fedora? If so, what kernel version did the issue
   *first* appear?  Old kernels are available for download at
   https://koji.fedoraproject.org/koji/packageinfo?packageID=8 :

Yes, previous versions worked fine.  If I boot using the 5.12 kernel things appear to work perfectly.


4. Can you reproduce this issue? If so, please provide the steps to reproduce
   the issue below:

Issue can be reproduced ever time when booting the 5.13.4-200 kernel.  GDM or SDDM display managers exhibit the exact same error.  Also, doesn't matter if you are using GNOME Wayland or Plasma Wayland.  Error occurs every time.  Backing out to the previous kernel (5.12) resolves issue.


5. Does this problem occur with the latest Rawhide kernel? To install the
   Rawhide kernel, run ``sudo dnf install fedora-repos-rawhide`` followed by
   ``sudo dnf update --enablerepo=rawhide kernel``:

Haven't tried.  Will do and update the ticket.


6. Are you running any modules that not shipped with directly Fedora's kernel?:
No.  

7. Please attach the kernel logs. You can get the complete kernel log
   for a boot with ``journalctl --no-hostname -k > dmesg.txt``. If the
   issue occurred on a previous boot, use the journalctl ``-b`` flag.


Will get a fresh error log and attach.