kern/56761: Kernel hang/freeze on i915 DRM init

[reinoud%13thmonkey.org@localhost]

>Number:         56761
>Category:       kern
>Synopsis:       Kernel hang/freeze on i915 DRM init
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 18 14:55:00 +0000 2022
>Originator:     Reinoud Zandijk
>Release:        NetBSD 9.99.94
>Organization:
NetBSD
	
>Environment:
	
	
System: NetBSD gorilla.13thmonkey.org 9.99.94 NetBSD 9.99.94 (GENERIC) #7: Fri Mar 18 15:24:47 CET 2022 reinoud%gorilla.13thmonkey.org@localhost:/tmp/obj-udf/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64

Graphics card:
000:02:0: Intel HD Graphics (GT1) (VGA display, revision 0x0b)
000:02:0: 0x0a068086 (0x0300000b)

(from Xorg.0.log on 9.99.81)
[    79.081] (--) intel(0): Output HDMI1 using initial mode 1920x1080 on pipe 0

>Description:
On booting a new -current 9.99.94 kernel the dmesg scrolls by but after around
the equivalent line on 9.99.83:
[     8.076074] kern info: [drm] failed to retrieve link info, disabling eDP
the display blacks out and switches off and the kernel hangs hard! It is not
booting further and there is no harddisc access after it.

	
>How-To-Repeat:
Boot 99.99.94 on the machine
	
>Fix:
Unknown
	

>Unformatted: