[Bug 105887] [GLK] no signal after switch resolution from 1080p at 23.98

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105887

--- Comment #114 from Daniel Scheller <d.scheller.oss at gmail.com> ---
(In reply to Clinton Taylor from comment #113)
> https://patchwork.freedesktop.org/patch/236192/
> 
> V4 of the patch has been submitted upstream. This patch will not apply
> cleanly to the 4.15 kernel. To apply to 4.15 change INTEL_OUTPUT_DDI to
> INTEL_OUTPUT_UNKNOWN

Clint,

first up, sorry for the hassle regarding OUTPUT_UNKNOWN and OUTPUT_DDI with
more current kernels in mind.

I applied your latest patch to 4.17.4 sources (slight conflict fixups required,
see [1] for the result) and put the DRM_ERROR() back in which prints the
current connector type ([2]). On 4.17, the check for _UNKNOWN or _DDI even
doesn't seem to be needed anymore, the debug print will always report connector
type 64, even directly after boot/hwinit/i915 load. Long story short, the patch
still works well.

Test debs based on 4.17.4 at [3].

Will keep the latest 4.15 patches/branches around though, as they eventually
are candidates for a possible "Ubuntu stable kernel" inclusion when your fix is
merged into some linux/drm kernel tree.

[1]
https://github.com/herrnst/ubuntu-bionic-kernel/commit/c514d34616e9c54fa07efb316019d0c5fc410cf2
[2]
https://github.com/herrnst/ubuntu-bionic-kernel/commit/2c00ac7bb2208f29573d6e7455126f744536d2a6
[3]
https://github.com/herrnst/ubuntu-bionic-kernel/tree/4.17.4-ubuntu-glktesting7-deb

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