For P49W-30's display

[Jaas-Wang]

What problem are you hitting

On MacOs 26, The P49W-30 have
5120 × 1440 （Default）
4608 × 1296
4096 × 1152
3840 × 2160
3840 x1080
3440 × 1440
3360 × 946
3360 × 945
3200 x 900
3200 × 900 （low resolution）
3008 x 846
3008 × 846 （low resolution）
2560 × 1440
2560 x 720
2560 × 720 （low resolution）
2304 × 648
2304 × 648 （low resolution）
2048 × 576
2048 × 576 （low resolution）
1920 ×1080,
but Crisp just display
Show all resolutions
5120 x 1440 （Default）
and HiDPI
3360 x 946
3360 x 945
3200 x 900
3008× 846
2560 x 720
1920 x1080
1720 ×720
1280 × 720.

What do you suggest

If can set 3840 x1080, 4608 × 1296 and 4096 × 1152 as HiDPI, it's better.

What do you do today

No response

[didriksg]

Two things are mixed in here, and I hit both myself today on another 5K2K monitor (a 5120x1440 Dell), so this isn't specific to the P49W-30.

The missing sizes under "Show all resolutions" are a Crisp bug. The list only kept sizes that also exist as HiDPI pairs, which works on ordinary monitors, but on a 5K2K ultrawide that drops exactly the useful ones: 4608x1296, 4096x1152 and 3840x1080 only exist as plain 1x modes there. I've fixed it; the fix ships in the next release. The 16:9 and 21:9 sizes System Settings also lists (3840x2160, 3440x1440, 2560x1440, 1920x1080) stay hidden on purpose, they don't match the panel's shape.

Making 3840x1080 and up actual HiDPI is out of Crisp's hands with the current mechanism: macOS won't allocate a scaled framebuffer wider than about 6720 px for these panels, and HiDPI 3840x1080 would need 7680x2160. That's also why the smooth-scaling slider tops out around "looks like 3360x945". The way around it is a mirrored virtual display, which I've opened #65 for. Follow that one for the HiDPI half; this issue I'll close when the list fix lands.