1. Please describe the problem:

System fails to resume from suspend on kernel 5.10.4. Monitors wake up but have a blank display and no input response or disk activity.

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

5.10.4-200.fc33.x86_64 (from https://koji.fedoraproject.org/koji/buildinfo?buildID=1663265)

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 :

Worked in 5.9.16-200.fc33.x86_64

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

Yes - just suspend and try to resume on this system (Asus PRIME H270-PRO motherboard, Core i5-7500 CPU)

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``:

n/a - 5.10 kernel test

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.

Used "echo 1 > /sys/power/pm_trace" prior to suspending. After failed resume and reset into the same kernel, saw this:

Dec 07 18:00:00 haswell kernel: PM:   Magic number: 0:161:320
Dec 07 18:00:00 haswell kernel: platform microcode: hash matches
Dec 07 18:00:00 haswell kernel: tty tty45: hash matches

The microcode driver seems like a possible culprit.

Will attach kernel log from normal boot with this kernel.