> Date: Sun, 26 Dec 2021 02:37:31 +0900 > From: Ryo ONODERA <[email protected]> > > If panic is removed, my LCD turns black finally and stay black forever > and does not reach to USB serial console. > [...] > However I am not sure because I cannot get any message. > > Do you have an idea to investigate deeper?
Does your laptop have anything like Intel AMT which you could use to get serial-over-LAN? Maybe you can put in a panic later, after the display changes, and build your kernel with DDB_COMMANDONENTER="bt;sync", so you might be able to either (a) get a crash dump or (b) see the last boot's dmesg when the machine resets (and you then boot an older kernel)?
