linux-kernel - Re: "flip_done timed out" messages causing huge increase in boot time

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Message-ID: <CANMdSOxCFbf3tbdNY4UMrs0voJ2as_Sq9UfWwdMt+Rttpg=fWg@mail.gmail.com>
Date:   Mon, 7 Jan 2019 18:54:16 +0100
From:   Daniel Kamil Kozar <dkk089@...il.com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, airlied@...ux.ie, azhar.shaikh@...el.com,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: "flip_done timed out" messages causing huge increase in boot time

I submitted the bug report at
https://bugs.freedesktop.org/show_bug.cgi?id=109245 . The dmesg log is
attached to the bug report.

Daniel

On Mon, 7 Jan 2019 at 14:34, Ville Syrjälä
<ville.syrjala@...ux.intel.com> wrote:
>
> On Sat, Jan 05, 2019 at 12:47:12AM +0100, Daniel Kamil Kozar wrote:
> > Hello.
> > After upgrading the kernel to 4.20, I noticed that the boot time
> > increased from about 5 seconds to 25 seconds. My machine is an Asus
> > K53SV with an Intel i7-2630QM, i.e. Sandy Bridge. I have an external
> > display connected to it via HDMI. If the display is unplugged when
> > booting the machine, the boot time stays at its old value.
> > The kernel log shows two messages like this :
> >
> > [   15.747206] [drm:drm_atomic_helper_wait_for_flip_done
> > [drm_kms_helper]] *ERROR* [CRTC:39:pipe A] flip_done timed out
> > [   26.198968] [drm:drm_atomic_helper_wait_for_dependencies
> > [drm_kms_helper]] *ERROR* [CRTC:39:pipe A] flip_done timed out
>
> Hrm. With SNB I would be tempted to blame the LP3 watermarks, but
> 4.20 already has commit 21556350ade3 ("drm/i915: Disable LP3 watermarks
> on all SNB machines").
>
> Can you file a bug at
> https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel
> and attach the full dmesg from the boot with drm.debug=0xe passed to the
> kernel cmdline?
>
> --
> Ville Syrjälä
> Intel