Bug#630345: xserver-xorg-video-radeon: Xserver crashes with HD6700M card

[Willian Veiga]

Alex Deucher, I have an AMD Radeon HD 6470M but I can't select which
card I want to use in  the BIOS setup.

How do I know if my GPU display is MUXes or MUX-less? I've tried to
select the discrete card using vgaswitcheroo but i get a black screen
and the computer crashes.

# lspci -v
01:00.0 VGA compatible controller: ATI Technologies Inc NI
Seymour00:02.0 VGA compatible controller: Intel Corporation 2nd
Generation Core Processor Family Integrated Graphics Controller (rev
09) (prog-if 00 [VGA controller])
	Subsystem: Dell Device 04ca
	Flags: bus master, fast devsel, latency 0, IRQ 54
	Memory at f6400000 (64-bit, non-prefetchable) [size=4M]
	Memory at d0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at f000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [a4] PCI Advanced Features
	Kernel driver in use: i915

 [AMD Radeon HD 6470M] (prog-if 00 [VGA controller])
	Subsystem: Dell Device 04ca
	Flags: bus master, fast devsel, latency 0, IRQ 56
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	Memory at f7b20000 (64-bit, non-prefetchable) [size=128K]
	I/O ports at e000 [size=256]
	Expansion ROM at f7b00000 [disabled] [size=128K]
	Capabilities: [50] Power Management version 3
	Capabilities: [58] Express Legacy Endpoint, MSI 00
	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
	Capabilities: [150] Advanced Error Reporting
	Kernel driver in use: radeon

# uname -a
Linux willian 3.0.0-1-amd64 #1 SMP Wed Aug 17 04:08:52 UTC 2011 x86_64 GNU/Linux

Thank you very much.