[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 #52 from fatez <stefano.ruzzon at icloud.com> ---
(In reply to Daniel Scheller from comment #51)
> (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.

Could you explain exactly how to do it? Also I use Ubuntu 18.04

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