drm2 and the kernel messages on shutdown

[Ruslan Mahmatkhanov]

Good day,

since switching to new drm code (starting at April if I recall 
correctly) I'm experiencing sporadic laptop hangs when choose the 
shutdown command in UI (gnome) environment. The hdd led isn't blinking 
but the laptop is still up. In such cases I forced to shutdown it by 
pressing power off button, but at the next system start it running 
filesystem checks (yes, with journal but some time only full fsck is 
able to fix that). What I'm asking for is - when there some sysctl or 
boot loader option will be available to turn on kernel messages on 
shutdown? I really want to know on what it hanging on. I didn't bothered 
with this while it was available as third-party patch, but since it is 
now in -current and enabled by default, I think this feature should be 
available. Thanks.

-- 
Regards,
Ruslan

Tinderboxing kills... the drives.