How I helped fix sleep-wake hangs on Linux with AMD GPUs

Adventures in programming, hardware, DSP, and chiptune

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I hadn't restarted my serial logger after I rebooted my laptop, leaving me with no clue about what caused the crash.

Probably way too late now, but if it was a proper kernel panic, it should've saved the dmesg in the kernel's pstore which saves to either ACPI or EFI storage (depending on BIOS or UEFI), which systemd then extracts to /var/lib/systemd/pstore/ on next reboot.