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kern/49964: DRM/KMS panic on Radeon hardware

>Number:         49964
>Category:       kern
>Synopsis:       DRM/KMS panic with Radeon hardware
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jun 11 02:40:00 +0000 2015
>Release:        NetBSD 7.0_BETA
System: NetBSD lithium 7.0_BETA NetBSD 7.0_BETA (GENERIC) #2: Wed Nov 19 15:12:31 MSK 2014  asau@lithium:/usr/obj/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
	NetBSD 7.0_BETA i386 built from the source as of 2015-06-01 panics at boot.

savecore does not function.

Last messages are:

drm: initializing kernel modesetting (RV710 0x1002:0x9552 0x103C:0x7016)
drm: register mmio base: 0xd8400000
drm: register mmio size: 65536
DRM error in radeon_get_bios: Unable to locate a BIOS ROM
: error: Fatal error during GPU init
radeon0: unable to attach DRM: 22
panic: cnopen: no console device

	Update, install new kernel, reboot.
	Boot previous kernel.

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