PP not choosing the best screen mode when specifying screen_mode

[zhouruixi]

Using drm_info, It shows my monitor supports the following modes:
│ │ ├───1920x1080@59.94 preferred driver phsync pvsync 16:9
│ │ ├───1920x1080@60.00 driver phsync pvsync
│ │ ├───1920x1080@60.00 driver phsync pvsync 16:9
│ │ ├───1920x1080@60.00 driver phsync pvsync interlace 16:9
│ │ ├───1920x1080@59.94 driver phsync pvsync interlace 16:9

Run pp without specifying screm_mode, The monitor shows 1920x1080@60Hz.
Run pp with --screen-mode 1920x1080@60Hz, The monitor shows 1080i60.

So, PixelPilot_rk choosing the 1920x1080@60.00 interlace mode, which is not the best. We should prefer using non-interlaced mode at the same resolution and refresh rate. And PixelPilot_rk not support --screen-mode 1920x1080@59.94

[henkwiedig]

I already implemented a fallback mode here: b346c44

[zhouruixi]

I already implemented a fallback mode here: b346c44

What I want to talk about is not the fallback screen mode. 1920x1080@60.00 driver phsync pvsync, 1920x1080@60.00 driver phsync pvsync 16:9 and 1920x1080@60.00 driver phsync pvsync interlace 16:9 are all named 1920x1080@60, when using --screen-mode 1920x1080@60, PP_rk is working but use 1920x1080@60.00 driver phsync pvsync interlace 16:9, however 1920x1080@60.00 driver phsync pvsync or 1920x1080@60.00 driver phsync pvsync 16:9 which without interlace is better.