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* [REGRESSION] nouveau: 30 second boot hang after commit 2b700825e
@ 2016-03-01  7:45 Eric Biggers
  2016-03-02  3:22 ` Alexandre Courbot
  0 siblings, 1 reply; 4+ messages in thread
From: Eric Biggers @ 2016-03-01  7:45 UTC (permalink / raw)
  To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW; +Cc: bskeggs-H+wXaHxf7aLQT0dZR+AlfA

Hello,

I am encountering a 30 second hang during boot, in the Xorg process just before
the display manager comes up.  I have bisected the problem to the following
commit:

	commit 2b700825e7a7702fb862edba1262c98040dc1bf6
	Author: Ben Skeggs <bskeggs@redhat.com>
	Date:   Thu Aug 20 14:54:22 2015 +1000

	    drm/nouveau/mc: move device irq handling to platform-specific code

The hang only occurs with CONFIG_DEBUG_SHIRQ=y, which is why I didn't notice it
sooner (I don't usually compile my kernels with that option).

Based on the log output with drm_debug=0x3f, the hang is occurring in
nouveau_gem_ioctl_cpu_prep(), where there is a 30 second timeout.

This is on an "Optimus" laptop which has both an Intel and an Nvidia card.  I
understand that the Nvidia card is being disabled automatically, and only the
Intel one is used; but the nouveau driver obviously still does a few things
either way.  The Nvidia hardware is: NVIDIA Corporation GK107GLM [Quadro K1100M]
(rev a1).

I don't have the expertise to fully assess the suspect commit.  Any thoughts as
to the root cause of this problem?  Is there any other information I can
provide?

Eric
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^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2016-03-09  4:24 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-03-01  7:45 [REGRESSION] nouveau: 30 second boot hang after commit 2b700825e Eric Biggers
2016-03-02  3:22 ` Alexandre Courbot
     [not found]   ` <CAAVeFuLMwZ4Bq4mx5St3shcCwzN67ZPHdhBB1_WCahFwH1zXCA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-02  3:48     ` Eric Biggers
2016-03-09  4:24     ` Eric Biggers

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