https://bugs.freedesktop.org/show_bug.cgi?id=109206

--- Comment #20 from Gavin A. <grakbug@gmail.com> ---
I changed my kernel to the linux-amd-staging-drm-next-git which already has
patch applied.  System boots, X starts fine, and I am able to run intensive 3d
app without any performance/rendering issues, no special kernel commandline
required.  I get same error message as comment #19, but no “scrambled pixels.”

NB For users with HP Envy x360 15m-bq1**** model laptops, the latest BIOS is
F.20 which is not listed in the downloads section of HP support site, but
rather under Advisories,
https://support.hp.com/us-en/product/hp-envy-15m-bq100-x360-convertible-pc/16851057/model/18967057/document/c06219875
.

NB2 For system stability, I added kernel option idle=nomwait which seems to
have made the laptop far less crashy, YMMV.

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