Bug#852698: linux-image-4.9.0-1-amd64: nouveau seems to hang programs like lspci and Xorg

[Bernhard Ehlers <be@bernhard-ehlers.de>]

Same here, optimus graphics with NVIDIA GT650M and intel graphics. Up to kernel version 4.8 the graphics is working fine. With kernel 4.9.2 X hangs. Also „lspci“ hangs.

Starting in text mode (sudo systemctl set-default multi-user.target) I can issue lspci:
01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 650M] (rev a1) (prog-if 00 [VGA controller])
	Subsystem: Dell GK107M [GeForce GT 650M]
	Flags: bus master, fast devsel, latency 0, IRQ 31
	Memory at f0000000 (32-bit, non-prefetchable) [size=16M]
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Memory at d0000000 (64-bit, prefetchable) [size=32M]
	I/O ports at 3000 [size=128]
	Expansion ROM at <ignored> [disabled]
	Capabilities: [60] Power Management version 3
	Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [78] Express Endpoint, MSI 00
	Capabilities: [b4] Vendor Specific Information: Len=14 <?>
	Capabilities: [100] Virtual Channel
	Capabilities: [128] Power Budgeting <?>
	Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
	Capabilities: [900] #19
	Kernel driver in use: nouveau
	Kernel modules: nouveau

Workaround is to blacklist nouveau.