Re: drmkms solid hang on T200 laptop booting GENERIC amd64

[Jarle Greipsland <jarle%uninett.no@localhost>]

Dave Tyson <dtyson%anduin.org.uk@localhost> writes:
> I have been testing current on a Lenovo T200 (type 2504) on and off for a while. I think the last successful boot of current was GENERIC from 29th October before the KMS code was add the the GENERIC config. IIRC the DRMKMS kernel from that base would hang.
> 
> With GENERIC (AMD64) CVS'ed and compiled from a couple of days ago the system boots and then hangs in the KMS code. kernel messages just before hang:
[ ... ]
> DRM error in init_ring_common: render ring initialization failed ctl 0001f001 head 0543b084 tail 00000000 start 00003000
> warning: /usr/src/sys/external/bsd/drm2/dist/drm/i915/intel_pm.c:5734: !power_domains->domain_use_count[domain]
> 
I see the exact same thing on a Lenovo T400s with NetBSD/i386
current.  I have also found that if I boot an older kernel with
drmkms enabled first (single-user and immediate reboot-command is
sufficient), then the current kernel boots all the way to
multi-user, and X11 works.
					-jarle