[Nouveau] unstable refresh rate

[Ilia Mirkin]

Can you try something very simple - unplug the cable, and plug it back
in, while the TV is on, and set to the HDMI input? That should ensure
that the SCDC write can go through at modeset time.

You can also force nouveau to avoid any modes that require scrambling
by booting with nouveau.hdmimhz=340.

Cheers,

  -ilia

On Tue, Aug 6, 2019 at 1:15 PM James <bjlockie at lockie.ca> wrote:
>
> I was going to buy a new cable and I came across this description:
>  >Category 2 Certified HDMI wire supports resolutions up to 4Kx2K (UHD)
> @30 Hz
>
> https://www.cnet.com/how-to/what-is-hdmi-2-0b/
> > HDMI versions compared
> > HDMI Version  Max Resolution  Max 4K Frame rate       HDCP 2.2        HDR     WCG     Hybrid Log Gamma        Dynamic Metadata
> > 1.4   4K      30Hz    No      No      No      No      No
> > 2.0   4K      60Hz    Yes     No      No      No      No
> > 2.0a  4K      60Hz    Yes     Yes     Yes     No      No
> > 2.0b  4K      60Hz    Yes     Yes     Yes     Yes     No
> > 2.1   10K     120Hz   Yes     Yes     Yes     Yes     Yes
>
> "Category 2" implies HDMI 2 but the "Max 4K Frame rate" of 30Hz says it
> is HDMI-1.4.
>
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