[Bug 108781] 4.19 Regression - Hawaii (R9 390) boot failure - Invalid PCC GPIO / invalid powerlevel state / Fatal error during GPU init

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108781

--- Comment #10 from jamespharvey20 at gmail.com ---
Bisecting results are below.

This is an Asus model STRIX-R9390-DC3OC-8GD5-GAMING.

Don't think is relevant, oter than why someone was looking at this code, but
this commit immediately trails a bunch of the vkms commits, and the crash/to
black screen happens right when amdgpu is attempting to automatically switch to
kms.

0d99889109892396a8164bf6dd178e36d3fe3166 is the first bad commit
commit 0d99889109892396a8164bf6dd178e36d3fe3166
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Thu Jun 28 16:13:07 2018 +0300

    drm/fb-helper: Eliminate the .best_encoder() usage

    Instead of using the .best_encoder() hook to figure out whether a given
    connector+crtc combo will work, let's instead do what userspace does and
    just iterate over all the encoders for the connector, and then check
    each crtc against each encoder's possible_crtcs bitmask.

    v2: Avoid oopsing on NULL encoders (Daniel)
        s/connector_crtc_ok/connector_has_possible_crtc/

    Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
    Cc: Harry Wentland <harry.wentland at amd.com>
    Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
    Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
    Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
    Suggested-by: Daniel Vetter <daniel.vetter at ffwll.ch>
    Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180628131315.14156-2-ville.syrjala@linux.intel.com

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