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SubjectRe: [Intel-gfx] screen freeze with 5.2-rc6 Dell XPS-13 skylake i915
Date
On Thu, 2019-07-11 at 13:11 -0700, James Bottomley wrote:
> 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.

Take at look of what PSR version is supported by your panel, it likely
that a notebook shipped with Skylake will have panel that supports only
PSR1 so that patch has no effect on your machine.

sudo more /sys/kernel/debug/dri/0/i915_edp_psr_status
Sink support: yes [0x01]

Only if you have 0x03 your panel have support for PSR2.

Or check your dmesg:
[drm:intel_psr_init_dpcd [i915]] eDP panel supports PSR version 1

>
> James
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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