[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 #86 from Daniel Scheller <d.scheller.oss at gmail.com> ---
(In reply to Daniel Scheller from comment #85)
> (In reply to Jani Saarinen from comment #80)
> > reference: https://patchwork.freedesktop.org/series/44446/
> 
> This patch (backported to the Ubuntu 4.15.0 kernel sources as a replacement
> for the "hack selection", see above) doesn't work on my J5005-ITX either.
> Upon boot, the "No signal" issue is back, reverting to the previous kernel
> with the plain 50ms wait makes it work again.

Sadly can't just edit the comment. For reference, the hardware IDs for the GLK
GPU on this board (lspci -vvn):

00:02.0 0300: 8086:3184 (rev 03) (prog-if 00 [VGA controller])
        Subsystem: 1849:2212

Again, unconditionally waiting 50ms at the end of
intel_ddi_disable_transcoder_func() works, so I suspect all GLK hardware needs
this, not only the NUCs.

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