[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 #107 from Daniel Scheller <d.scheller.oss at gmail.com> ---
(In reply to Clinton Taylor from comment #103)
> Version 3 of the patch has been sent to the intel-gfx mail list.
> 
> Changes:
> Delay increased to 100ms based on review feedback. 
> Confirm crtc_state->type is HDMI, so we don't delay for other output types.
>  
> https://patchwork.freedesktop.org/patch/233505/

Thanks for the updated patch. Though, this iteration brings the issue back at
least during boot when i915.ko is loaded: My J5005-ITX prints it's boot
messages after powering on the system. Then, when i915 first initialises the
hardware and switches the FB to 1080p50 (forced via
"video=HDMI-A-1:1920x1080 at 50" on the kernel command line), I get the "No
signal" problem. Shortly after, when X and Kodi are started, the picture
returns due to some "xset" commands that are run. From within Kodi, playing a
23.976p movie and stopping (thus switching to 1080p50 again), picture remains
and there are no more issues. Maybe the connector check causes the initial
issue here?

For reference, the backported patch is at [1] and kernel debs at [2].

[1]
https://github.com/herrnst/ubuntu-bionic-kernel/commits/4.15.0-24-26-glktesting4
[2]
https://github.com/herrnst/ubuntu-bionic-kernel/tree/4.15.0-24.26-glktesting4-deb

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