https://bugs.kde.org/show_bug.cgi?id=444298

--- Comment #9 from battler...@gmail.com ---
(In reply to Vlad Zahorodnii from comment #7)
> Based on drm_info output
> 
> │   ├───CRTC 0
> │   │   ├───Object ID: 53
> │   │   ├───Mode: 2560x1440@199.99 driver phsync nvsync
> │   │   ├───Gamma size: 256
> │   │   └───Properties
> │   │       ├───"ACTIVE" (atomic): range [0, 1] = 1
> │   │       ├───"MODE_ID" (atomic): blob = 114
> │   │       │   └───2560x1440@199.99 driver phsync nvsync
> 
> 
> and wayland session log
> 
>   kwin_wayland_drm: crtc 53
>   kwin_wayland_drm:   "MODE_ID": 114->108
> 
> it indeed looks like kwin tries to change the mode with refresh rate of
> 199.99Hz to (I guess) 244Hz, but the atomic test only commit fails (perhaps
> due to bandwidth limitation?). Can you try unplugging the other output?

Disconnecting the second monitor alone doesn't work, I was able to get it to
work after disconnecting the second monitor and restarting then setting it to
240hz.

I guess its as you say, a bandwidth limitation, i'm running an RX580 on the
PCIE16X_3 slot on the asus x570 dark hero which for some odd reason defaults to
x4 according to the bios.

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