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SubjectRe: screen freeze with 5.2-rc6 Dell XPS-13 skylake i915
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On Thu, 2019-07-11 at 10:29 +0100, Chris Wilson wrote:
> Quoting James Bottomley (2019-06-29 19:56:52)
> > The symptoms are really weird: the screen image is locked in
> > place. The machine is still functional and if I log in over the
> > network can do anything I like, including killing the X server and
> > the display will never alter. It also seems that the system is
> > accepting keyboard input because when it freezes I can cat
> > information to a file (if the mouse was over an xterm) and verify
> > over the network the file contents. Nothing unusual appears in
> > dmesg when the lockup happens.
> >
> > The last kernel I booted successfully on the system was 5.0, so
> > I'll try compiling 5.1 to narrow down the changes.
>
> It's likely this is panel self-refresh going haywire.
>
> commit 8f6e87d6d561f10cfa48a687345512419839b6d8
> Author: José Roberto de Souza <jose.souza@intel.com>
> Date: Thu Mar 7 16:00:50 2019 -0800
>
> drm/i915: Enable PSR2 by default
>
> The support for PSR2 was polished, IGT tests for PSR2 was added
> and
> it was tested performing regular user workloads like browsing,
> editing documents and compiling Linux, so it is time to enable it
> by
> default and enjoy even more power-savings.
>
> Temporary workaround would be to set i915.enable_psr=0

It looks plausible. I have to say I was just about to mark a bisect
containing this as good, but that probably reflects my difficulty
reproducing the issue.

James

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