(In reply to Duncan Roe from comment #6) > (In reply to Duncan Roe from comment #3) > > halt is fine btw, it's only reboot that breaks. > > Do you want extra debug turned on for dmesg? > > At Linux 19.0-rc8, power button / halt command also fails. The backlight > goes off but the power stays on. Can you bisect that? Is it the same commit?