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

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I should really get to bed ... of course, I meant
516a49cc19467e298d08a404f73a6e311f4548d1 ;-)

On Sat, 5 Jan 2019 at 01:16, Daniel Kamil Kozar <dkk089@xxxxxxxxx> wrote:
>
> Small omission on my part : I meant 4.19.12, not 4.19.2 as the last
> working version.
> Also, I can confirm that reverting
> 13947d150bae871bd880565ada318b0bcd0e690e from the current HEAD of
> linux-stable fixes the issue.
>
> On Sat, 5 Jan 2019 at 00:47, Daniel Kamil Kozar <dkk089@xxxxxxxxx> 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
> >
> > Which are the only ones that don't appear in 4.19.2, where the boot
> > time was smaller. Bisecting the commits between these two versions
> > leads to commit 516a49cc19467e298d08a404f73a6e311f4548d1.
> >
> > Let me know if you need more information.
> >
> > Kind regards,
> > Daniel
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