Arch Linux

merilius

Member

Registered: 2012-06-15

Posts: 51

240 Hz looks like 30 Hz (4K, Plasma, X11, Nvidia, DP)

I got an 240 Hz OLED panel during Black Friday and it has problems with frequencies higher than 120 Hz in KDE Plasma X11.

When set to 60 or 120 Hz it clearly maintains these refresh rates, but 180 and 240 Hz look horrible: like ~30 Hz (definitely worse than 60 Hz)
The panel is connected via DP to an RTX 4080. It does report 240 Hz mode, and nvidia-settings shows 240 Hz too.
Setting powermizer to performance does not help. Neither does forcing (full) composition pipeline.

I have dual boot and under Win64 240 Hz looks fine.
Cinnamon looks fine.

How to fix it?

Last edited by merilius (2024-12-03 22:43:23)

pvtvega

Member

Registered: 2024-11-25

Posts: 91

Re: 240 Hz looks like 30 Hz (4K, Plasma, X11, Nvidia, DP)

Do you have multiple monitors connected? Does it exhibit the same sluggish feeling at 240 Hz under Wayland?

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,153

Re: 240 Hz looks like 30 Hz (4K, Plasma, X11, Nvidia, DP)

… or when suspending the compositor on X11 (shift+alt+f12)?

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merilius

Member

Registered: 2012-06-15

Posts: 51

Re: 240 Hz looks like 30 Hz (4K, Plasma, X11, Nvidia, DP)

Just one monitor.
Previously I had a 160 Hz monitor and it very smooth.

I enabled kde-unstable and now it supports Wayland. Under Wayland it works flawlessly. I am switching to Wayland

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,146

Re: 240 Hz looks like 30 Hz (4K, Plasma, X11, Nvidia, DP)

kde-unstable can and will break and will mandate you activate the testing repos. As there's currently nothing in there that would relate to your shell and in order to not run into surprises, I'd strongly reccommend to not switch to kde-unstable unless you actually mean to test future beta releases. The stable repos have all of the current state as far as Wayland/KDE compat is concerned.