[Nouveau] Request for help in adding a HDMI output

[Ilia Mirkin]

On Fri, Jan 22, 2021 at 2:13 PM o1bigtenor <o1bigtenor at gmail.com> wrote:
>
> On Fri, Jan 22, 2021 at 12:26 PM Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> snip
> > Can you provide the output of "xrandr --verbose" before you've messed
> > around with anything like modelines/etc?
> >
>
> Its huge - - -

Unfortunately it looks like you did this *after* messing with modelines.

>
> $ xrandr --verbose

[ ... snip ...]

> HDMI-1-2 connected (normal left inverted right x axis y axis)
> Identifier: 0xf9
> Timestamp:  483290
> Subpixel:   unknown
> Clones:
> CRTCs:      4 5
> Transform:  1.000000 0.000000 0.000000
>             0.000000 1.000000 0.000000
>             0.000000 0.000000 1.000000
>            filter:
> EDID:
> 00ffffffffffff0020a32f0001000000
> 0c1a0103807341780acf74a3574cb023
> 09484c21080081c08140818001010101
> 01010101010104740030f2705a80b058
> 8a00501d7400001e023a801871382d40
> 582c4500501d7400001e000000fc0048
> 4953454e53450a2020202020000000fd
> 00184b0f511e000a202020202020017f
> 02034571525f5e5d0102040510111314
> 1f202122626364290907071507505506
> 0083010000e200f9e305ff016e030c00
> 1000383c20008001020304e50e60616a
> 6be3060d01011d8018711c1620582c25
> 00c48e2100009e011d80d0721c162010
> 2c2580c48e2100009e023a80d072382d
> 40102c4580c48e2100001e00000000d5

OK, so this is your 4k monitor. It is plugged into the *secondary*
GPU, and does not report any 4k at 60 modes in the EDID (well, it does
report 4k at 60 YUV 4:2:0 modes, but we don't support those in nouveau at
this time). Whether that's because the monitor itself doesn't support
HDMI 2.0, or you plugged it into your old GPU which does not support
HDMI 2.0, I couldn't say from just this output. What I can say is that
no amount of modelines will get you 4k at 60 in this setup with nouveau.

>   3840x2160_60.00 (0x6ce) 712.750MHz -HSync +VSync
>         h: width  3840 start 4160 end 4576 total 5312 skew    0 clock 134.18KHz
>         v: height 2160 start 2163 end 2168 total 2237           clock  59.98Hz
>   3840x2160R (0x70c) 533.000MHz +HSync -VSync
>         h: width  3840 start 3888 end 3920 total 4000 skew    0 clock 133.25KHz
>         v: height 2160 start 2163 end 2168 total 2222           clock  59.97Hz

And this is how I know you've messed with modelines. The whole point
of the above question was to see the pre-messing-with-modelines state.
This is not the default setup. The NVIDIA GTX 570 can only handle up
to 225mhz by default over HDMI, which isn't enough for the 4k at 30 modes
either. If you think it can handle more, you can try to override that
with the hdmimhz parameter. However I'd strongly recommend plugging
the 4k screen into the GTX 1050, as even if it did work on the
secondary GPU, sending a 4k screen to a remote GPU is really not a
great idea.

Cheers,

  -ilia