co...@sdf.org writes: > Hi folks, > > we're working on a drmkms update. > I'm testing it on a Dell XPS 9550. It's a laptop with a Skylake CPU. > It has a power button. The power button powers off, not reboot. > This means the dmesg buffer gets wiped. > No serial console as far as I know. > > Now it reaches a point where the screen changes, but my DDB_COMMANDENTER > containing "reboot" won't do the expected thing. It's possible it's > hanging. I can't seem to blindly enter ddb. > > Any suggestions to make debugging less painful? > Something like arm a watchdog to panic after some time. > > I'm gonna experiment with sprinkling panic("XXX"); and see if this works > out.
if you have ddb.onpanic=0 then it will write a crash dump and reboot. that should give you something useful.