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From: Matt Roper <matthew.d.roper@intel.com>
To: dann frazier <dannf@dannf.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>, intel-gfx@lists.freedesktop.org
Subject: Re: regression bisected: display sync drops after 7221fc33
Date: Tue, 2 Feb 2016 14:51:20 -0800	[thread overview]
Message-ID: <20160202225120.GI20935@intel.com> (raw)
In-Reply-To: <20160202222130.GA7636@fluid.dannf>

On Tue, Feb 02, 2016 at 03:21:30PM -0700, dann frazier wrote:
> On Tue, Jan 26, 2016 at 09:40:27AM -0700, dann frazier wrote:
> > On Tue, Jan 26, 2016 at 08:10:04AM -0700, dann frazier wrote:
> > > On Tue, Jan 26, 2016 at 01:17:01PM +0200, Ville Syrjälä wrote:
> > > > On Mon, Jan 25, 2016 at 09:35:26AM -0700, dann frazier wrote:
> > > > > I've got a Lenovo T410 w/ an external display (DisplayPort<->HDMI). After
> > > > > upgrading from a 4.2 kernel to a 4.3, I started hitting an issue where
> > > > > the display thinks it has lost input for a few moments. Oddly, it
> > > > > usually happens when I start typing in a terminal after a short period
> > > > > of inactivity.
> > > > > 
> > > > > I see no OS-side symptoms - there are no new messages in dmesg/syslog/Xorg
> > > > > log, etc.
> > > > 
> > > > Any fifo underrun reports in dmesg in general?
> > > 
> > > Yes, several:
> > >   [ 1886.547409] [drm:ironlake_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
> > > 
> > > > > I reproduced with latest Linus master (@ 3e1e21c7b), and then
> > > > > bisected down to the following commit:
> > > > > 
> > > > > commit 7221fc333dbe1743a3dff155b03527fda90d4ec1
> > > > > Author: Matt Roper <matthew.d.roper@intel.com>
> > > > > Date:   Thu Sep 24 15:53:08 2015 -0700
> > > > > 
> > > > >     drm/i915: Eliminate usage of pipe_wm_parameters from ILK-style WM (v2)
> > > > 
> > > > That's not in 4.3.
> > > 
> > > Ah, you're right. I was going by the version in the Makefile at that commit,
> > > which says 4.3.0-rc3. git naiveté.
> > > 
> > > > As far as currentl Linus tree goes, you may want to try these:
> > > > http://patchwork.freedesktop.org/patch/msgid/1452776015-22076-2-git-send-email-ville.syrjala@linux.intel.com
> > > > http://patchwork.freedesktop.org/patch/msgid/1452776015-22076-1-git-send-email-ville.syrjala@linux.intel.com
> > > 
> > > Building - I'll test and report back.
> > 
> > fyi, the problem persists with 4.5-rc1 + these 2 patches.
> 
> Hi - Is there any further information I can provide to assist with this?
> 
>   -dann

Hi Dann.  Could you test with 

http://patchwork.freedesktop.org/patch/72194/

and see if it has any effect on the behavior you see?

Thanks!


Matt


-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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  reply	other threads:[~2016-02-02 22:51 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-25 16:35 regression bisected: display sync drops after 7221fc33 dann frazier
2016-01-26 11:17 ` Ville Syrjälä
2016-01-26 15:10   ` dann frazier
2016-01-26 16:40     ` dann frazier
2016-02-02 22:21       ` dann frazier
2016-02-02 22:51         ` Matt Roper [this message]
2016-02-03  0:35           ` dann frazier
2016-02-03  2:04             ` Matt Roper
2016-02-04  2:44               ` dann frazier

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