[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 #51 from Daniel Scheller <d.scheller.oss at gmail.com> ---
(In reply to Clinton Taylor from comment #49)

> Issue does not occur if I disable 12 bpc support in the driver.
> 
> For a quick test:
> 
> In intel_hdmi.c  mothod hdmi_12bpc_possible()
> 
> add 
>    return false;

Using an ASRock J5005-ITX on stock Ubuntu 18.04 w/Kernel 4.15, connected to an
Onkyo TX-NR509 AV receiver, which shows similar sympthoms (ie. if the
resolution goes up (pixel clock rate increases) from the boot res to 1080p50 or
1080p60, the TV picture goes away/blue and the receiver says "No signal". The
receiver must be power-cycled to get a picture again).

Tried the above (modified Ubuntu kernel sources accordingly, repackaged,
installed and booted) - makes the issue go away with this workaround, switching
from 50p/60p to 24p and back works, no "No signal". Everything else
video-related remains working normally.

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