Interesting, I have a non-Framework laptop using the same AMD platform, and I’m observing the same kind of problems. RAM is ok as tested by memtest86+, nothing in the logs, just insta-reboot, vaguely reminiscent of what happens when some kind of overvoltage/overcurrent kicks in.
My system is GPD Win with a 7840HS inside, so yeah, but I’m just hoping against all hope the fix for the Framework could apply to my system, too.
I, however, have been so far unable to pin this on any particular graphics usage or CPU load (mine can reboot even when idle).
The only very finicky idea that’s on my mind right now is to set up continuous monitoring of all possible sensors and immediately sending them over the network so that hopefully a spike in temperature/voltage can be seen as close to the crash as possible.
I have tried setting up netconsole for the Linux kernel, but there wasn’t anything useful in the kernel log at the time of reboot. No warnings, no nothing. So very likely a firmware/hardware level protection kicking in.