[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 #50 from Clinton Taylor <clinton.a.taylor at intel.com> ---
(In reply to Clinton Taylor from comment #49)
>  (In reply to Piotr Kasp. from comment #48)
> > Product Code: BOXNUC7CJYH1
> > Regulatory model: NUC7JY
> > Date of Manufacture: 02/18
> > (no project code)
> > 
> > 
> > but i think doesn't matter same problem is on asrock, MSI etc.
> > its looks like mess arround HDMI 2.0, i tested coffe Lake with LSPCON and
> > there is eveything perfect.
> 
> CoffeeLake and GeminiLake use a different clock implementation. This issue

Correction, both CoffeeLake and GeminiLake use the BXT PLL code. 

> appears to be a PLL enable sequence issue when switching for lower to higher
> clock rates. 
>  
> 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;

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