[Bug 70388] [NV34] failed to idle channel 0xcccc0000 (also NV44A) - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 70388] [NV34] failed to idle channel 0xcccc0000 (also NV44A)
Date: Mon, 26 Feb 2018 11:53:35 +0000	[thread overview]
Message-ID: <bug-70388-8800-86pTdRZ87D@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-70388-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>

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https://bugs.freedesktop.org/show_bug.cgi?id=70388

Lukas Wunner <lukas-JFq808J9C/izQB+pC5nmwQ@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lukas-JFq808J9C/izQB+pC5nmwQ@public.gmane.org

--- Comment #37 from Lukas Wunner <lukas-JFq808J9C/izQB+pC5nmwQ@public.gmane.org> ---
(In reply to Linas Vepstas from comment #33)
> After this, starting X a second time does not generate any video-out, so
> monitors stay blanked. Nothing at all printed in /var/log/syslog. However
> kern.log shows:
> 
> Oct 31 15:41:47 fanny kernel: [ 2761.045902] INFO: task kworker/10:1:135
> blocked for more than 120 seconds.
> Oct 31 15:41:47 fanny kernel: [ 2761.045912]       Not tainted
> 3.18.0-rc2-linas #5
> Oct 31 15:41:47 fanny kernel: [ 2761.045915] "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> Oct 31 15:41:47 fanny kernel: [ 2761.045920] kworker/10:1    D
> ffff88085dd53040     0   135      2 0x00000000
> Oct 31 15:41:47 fanny kernel: [ 2761.045959] Workqueue: events
> output_poll_execute [drm_kms_helper]

This hung task issue has been fixed in v4.16-rc3 with
https://git.kernel.org/linus/d61a5c106351

It is unrelated however to the "failed to idle channel" issue AFAICS.

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