https://bugs.freedesktop.org/show_bug.cgi?id=107390

--- Comment #6 from Justinas Narusevicius <junaru@gmail.com> ---
Hey Alex,

Yes ac916c914c3156e53505e9ea3a9d1495518bf873 was found by bisecting mainline
kernel between tags of v4.16 (0adb32858b0bddf4ada5f364a84ed60b196dbcda good)
and v4.17-rc1 (60cc43fc888428bb2f18f08997432d426a243338 bad)

I can confirm that reverting ac916c914c3156e53505e9ea3a9d1495518bf873 via the
attached patch on current mainline kernel HEAD
(https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cd3f77d74ac31b4627cdfa70812338076a1ea475)
fixes all three issues.

* Mirroring is available once again.
* Extended desktop mode can now use all the resolutions up to and including 4K.
* There's no 3rd erroneous display on HDMI-A-2 anymore.

Should i test this against
https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next or any
other specific branch?

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