Add some descriptive --screen-mode arguments

[zhouruixi]

-screen-mode arguments only support <width>x<heigth>@<fps>. How about add some descriptive --screen-mode arguments, like max-fps, min-fps, max-resolution, min-resolution etc. Then PixelPilot_rk selects a suitable screen mode from the screen modes supported by the monitor.

[seriyps]

Great idea 👍

What is "mix-resolution"?

[zhouruixi]

mix-resolution

it's a typo, min-resolution

[seriyps]

While working on #28, I found interesting is that this structure which represents supported display mode https://www.kernel.org/doc/html/latest/gpu/drm-kms.html#c.drm_display_mode
Has a .type field and it can have DRM_MODE_TYPE_PREFERRED flag set, and I think it should be used as default resolution if nothing is explicitly specified

[zhouruixi]

While working on #28, I found interesting is that this structure which represents supported display mode https://www.kernel.org/doc/html/latest/gpu/drm-kms.html#c.drm_display_mode Has a .type field and it can have DRM_MODE_TYPE_PREFERRED flag set, and I think it should be used as default resolution if nothing is explicitly specified

Yes, it had a preferred, This should be the default screenmode. May due to compatibility issues, the preferred may not be the best. Or just order by fps, resolution desc and use the first one screen mode?

apt install drm-info
drm_info
You can see the connector modes, my monitor supports 2560x1080@75, but the preferred is 2560x1080@60

│   └───Connector 1
│       ├───Object ID: 111
│       ├───Type: HDMI-A
│       ├───Status: connected
│       ├───Physical size: 800x340 mm
│       ├───Subpixel: unknown
│       ├───Encoders: {1}
│       ├───Modes
│       │   ├───2560x1080@59.98 preferred driver phsync nvsync 
│       │   ├───2560x1080@74.99 driver phsync nvsync