kern/49744: blank screen DL-360 radeon

[christos%netbsd.org@localhost]

>Number:         49744
>Category:       kern
>Synopsis:       console is blank drm2/radeon
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 12 18:55:00 +0000 2015
>Originator:     Christos Zoulas
>Release:        NetBSD 7.99.6
>Organization:
	Broken Consoles, Inc.
>Environment:
System: NetBSD broadway.astron.com 7.99.6 NetBSD 7.99.6 (GENERIC) #0: Thu Mar 12 14:21:33 EDT 2015 christos%broadway.astron.com@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
GENERIC kernel blank console.
Here's the relevant part of dmesg:

drm: initializing kernel modesetting (RV100 0x1002:0x515E 0x103C:0x31FB).
drm: register mmio base: 0xf1cf0000
drm: register mmio size: 65536
radeon0: info: VRAM: 128M 0x00000000E8000000 - 0x00000000EFFFFFFF (64M used)
radeon0: info: GTT: 512M 0x00000000C8000000 - 0x00000000E7FFFFFF
drm: Detected VRAM RAM=80M, BAR=128M
drm: RAM width 16bits DDR
Zone  kernel: Available graphics memory: 17296072 kiB
Zone   dma32: Available graphics memory: 2097152 kiB
drm: radeon: 64M of VRAM memory ready
drm: radeon: 512M of GTT memory ready.
drm: GART: num cpu pages 131072, num gpu pages 131072
drm: PCI GART of 512M enabled (table at 0x00000000460B2000).
radeon0: info: WB disabled
radeon0: info: fence driver on ring 0 use gpu addr 0x00000000c8000000 and cpu addr 0x0xffff8003675bc000
drm: Supports vblank timestamp caching Rev 2 (21.10.2013).
drm: Driver supports precise vblank timestamp query.
radeon0: interrupting at ioapic0 pin 23 (radeon)
drm: radeon: irq initialized.
drm: Loading R100 Microcode
drm kern error: radeon_cp: Failed to load firmware "radeon/R100_cp.bin"
DRM error in r100_cp_init: Failed to load firmware!
radeon0: error: failed initializing CP (-2).
radeon0: error: Disabling GPU acceleration
drm: radeon: cp finalized
drm: No TV DAC info found in BIOS
drm: Radeon Display Connectors
drm: Connector 0:
drm:   VGA-1
drm:   DDC: 0x60 0x60 0x60 0x60 0x60 0x60 0x60 0x60
drm:   Encoders:
drm:     CRT1: INTERNAL_DAC1
drm: Connector 1:
drm:   VGA-2
drm:   DDC: 0x6c 0x6c 0x6c 0x6c 0x6c 0x6c 0x6c 0x6c
drm:   Encoders:
drm:     CRT2: INTERNAL_DAC2
radeondrmkmsfb0 at radeon0
radeon0: info: registered panic notifier
radeondrmkmsfb0: framebuffer at 0xffff8003674ba000, size 1024x768, depth 8, stride 1024
wsdisplay0 at radeondrmkmsfb0 kbdmux 1: console (default, vt100 emulation), using wskbd0

>How-To-Repeat:
>Fix: