AMD Framebuffer panic and shutdown

Running an iMac 2017 with Ventura. The computer shuts down while sleeping, then restarts but will not wake up. Shutting it down with the button and then restarting it results in a panic shutdown halfway through the reboot. This is with all externals unplugged. I have run several diagnostic programs, but haven't found anything. Also removed the antivirus and VPN.

Any help appreciated.

Rob A.

Here is the report:

panic(cpu 0 caller 0xffffff80124f928a): AMDFramebufferVIB::setPowerState(0xffffff8b92be3800 : 0xffffff7fa7c948ca, 0 -> 1) timed out after 45704 ms @IOServicePM.cpp:5547

Panicked task 0xffffff8b92454218: 223 threads: pid 0: kernel_task

Backtrace (CPU 0), panicked thread: 0xffffff9065f74598, Frame : Return Address

0xffffffbe13ea7a90 : 0xffffff8011dedf9d

0xffffffbe13ea7ae0 : 0xffffff8011f5b786

0xffffffbe13ea7b20 : 0xffffff8011f4aa10

0xffffffbe13ea7b70 : 0xffffff8011d88951

0xffffffbe13ea7b90 : 0xffffff8011dee27d

0xffffffbe13ea7c80 : 0xffffff8011ded929

0xffffffbe13ea7ce0 : 0xffffff80125e0ecb

0xffffffbe13ea7dd0 : 0xffffff80124f928a

0xffffffbe13ea7e30 : 0xffffff80124f8b49

0xffffffbe13ea7e40 : 0xffffff80125134ae

0xffffffbe13ea7e80 : 0xffffff80124f7968

0xffffffbe13ea7ea0 : 0xffffff8011e47b68

0xffffffbe13ea7ee0 : 0xffffff8011e48c1b

0xffffffbe13ea7fa0 : 0xffffff8011d8819e

Process name corresponding to current thread (0xffffff9065f74598): kernel_task

Mac OS version:

22A400

Kernel version:

Darwin Kernel Version 22.1.0: Sun Oct 9 20:14:54 PDT 2022; root:xnu-8792.41.9~2/RELEASE_X86_64

Kernel UUID: BF7C9676-EF23-3E8D-A2E2-25DAC63091B6

roots installed: 0

KernelCache slide: 0x0000000011a00000

KernelCache base: 0xffffff8011c00000

Kernel slide: 0x0000000011adc000

Kernel text base: 0xffffff8011cdc000

__HIB text base: 0xffffff8011b00000

System model name: iMac18,2 (Mac-77F17D7DA9285301)

System shutdown begun: NO

Panic diags file available: YES (0x0)

Hibernation exit count: 0