linux-kernel - Re: [3.14.0-rc4] regression: drm FIFO underruns

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Date:	Fri, 9 May 2014 18:11:37 +0200
From:	Jörg Otte <jrg.otte@...il.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...hat.com>,
	David Airlie <airlied@...ux.ie>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>
Subject: Re: [3.14.0-rc4] regression: drm FIFO underruns

>
> On Mon, May 5, 2014 at 9:51 AM, Jörg Otte <jrg.otte@...il.com> wrote:
>> I still have FIFO underruns in drm:
>> [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
>> [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun
>> [drm:cpt_serr_int_handler] *ERROR* PCH transcoder B FIFO underrun
>>
>> which I already reported here:
>> https://lkml.org/lkml/2014/4/9/127
>>
>> and which is still unanswered!
>>
>> I tried to bisect the thing, but I ran into compile errors. So I
>> can only say it came in with
>> e9f37d3 "Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux"
>>
>> Jörg
>
> Jörg, can you please boot with drm.debug=0xe, reproduce the issue and
> then attach the complete dmesg? Please make sure that the dmesg
> contains the boot-up stuff too.
>
> Thanks, Daniel
Here it is. I should mention it only happens at boot-up.

Thanks, Jörg


>
>
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch

Download attachment "dmesg-drm.debug" of type "application/octet-stream" (182799 bytes)