[Bug 111285] [psr] Unable to boot after update to 5.2.1 kernel (Skylake)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111285

--- Comment #8 from Takashi Iwai <tiwai at suse.de> ---
Apparently 5.2.7 doesn't seem solving the problem, according to openSUSE
bugzilla entry:
https://bugzilla.opensuse.org/show_bug.cgi?id=1143139#c30

> Martin Wilck 2019-08-07 13:32:47 UTC
>
> I have the same problem as in bug 1143755. It is *not* solved in 5.2.7-1.ga3e04b1 (the workaround "i915.enable_psr=0" helps), but it is solved in 5.3.rc3-1.1.g571863b. I have Skylake hardware:
>
> > $ cat /sys/kernel/debug/dri/0/i915_capabilities
> > gen: 9
> > platform: SKYLAKE
> > pch: 4
> > is_mobile: no
> > ...
> > has_psr: yes
>
> I've tried to figure out the relevant commit but I haven't yet. Note that 5.3-rc3 does not include the patch which disables PSR2 ( https://patchwork.freedesktop.org/patch/319173/?series=63774&rev=4).
>
> > $ git log --oneline --grep PSR -i v5.2..v5.3-rc3 -- drivers/gpu/drm/i915/
> > 6d61f71 drm/i915/vbt: Fix VBT parsing for the PSR section
> > 417f254 Merge tag 'drm-intel-next-2019-06-19' of git://anongit.freedesktop.org/drm/drm-intel into drm-next
> > 381f8a2 drm/i915/psr: Force manual PSR exit in older gens
> > 4d432f95 drm: Rename struct edp_vsc_psr to struct dp_sdp
> > 8e9d645 drm/i915/dp: Add a config function for YCBCR420 outputs
> > 6f08ebe drm/i915: Remove the unneeded AUX power ref from intel_dp_hpd_pulse()
>
> I suspected 381f8a2 but that makes little sense as that affects gen < 9 only, and I have gen = 9. So the only one that remains would be 6d61f71, no idea if that makes sense.

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