[Bug 98690] [SKL bisected] System freeze when starting X using kernel 4.9-rc1 or later

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98690

--- Comment #57 from Peter Ujfalusi <peter.ujfalusi at gmail.com> ---
Gleb,

(In reply to Gleb Nemshilov from comment #55)
> Created attachment 129332 [details]
> 4.10-rc6 without 1s delay
> 
> Hi Peter!
> 
> I've seen some changes were introduced in 4.10-rc6 with something related to
> polling in nouveau by Lyude Paul, specifically this patch:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
> ?id=cae9ff036eea577856d5b12860b4c79c5e71db4a
> 
> So I decided to try 4.10-rc6 without your patch with delayed event (so I
> reverted it) and kernel booted.
> 
> Can you confirm this?

I think the patch you have linked is essentially going to disable the poll_work
as such (imho the commit is bogus).
The mode_config.poll_enabled is set to true in the poll_init and it will never
going to be false after that. The poll_enable will not schedule the poll_work
if poll_enable is not true, the patch will not call the enable_poll in case
mode_config.poll_enabled is true. So the poll_work will never run.

> 
> dmesg log for 4.10-rc6 attached.

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