On Tue, 2012-10-30 at 00:06 +0100, Mathieu Chouquet-Stringer wrote:

Hi Ben,

Hey Mathieu,

I haven't been able to boot any 3.7 kernels since there's a regression which freezes my machine hard (a lenovo t530 with the dreaded optimus thing).

3.6 used to work but 3.7 get stuck at (copied by hand but I have an ugly screenshot if you'd like): nouveau [ VBIOS][0000:01:00.0] running init tables

Are you able to go back to the current master, and get me a log/screenshot with "nouveau.debug=trace" appended to your kernel options?

Thanks, Ben.

Note my uefi settings weren't modified during the whole thing.

I've bisected the issue and git found that commit 4196fa is the one causing trouble (looking at the diff, it's pretty big):

Author: Ben Skeggs bskeggs@redhat.com Date: Tue Jul 10 14:36:38 2012 +1000

drm/nouveau/i2c: port to subdev interfaces

v2/v3: Ben Skeggs <bskeggs@redhat.com>
- fix typo in default bus selection
- fix accidental loss of destructor

v4: Dmitry Eremin-Solenikov <dmitry_eremin@mentor.com>
- fix typo causing incorrect default i2c port settings when no BMP data

While bisecting the matter, I had a couple of messages like the following (6 actually). The addresses were always different (I could send another ugly screenshot if you'd like).

Condition still not met after 2000ms, skipping following opcodes

followed by:

Parsing VBIOUS init table 1 at offset 0x8183

At this point, the kernel was frozen hard (sysrq wasn't working)...

I'm attaching the output of lspci and my kernel config.

If you'd like me to add some debug statements or if you need more info, feel free, I'd love to help.

Cheers,