[Issue]: Missing 120Hz option at 4K resolution (Works on Win11, not PikaOS)
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- Dominant language
- C
- Stars
- 460
- Forks
- 143
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Description
Problem Description
Bug Report: 120Hz Refresh Rate Missing at 4K Resolution
System Specifications:
• OS: PikaOS 4
• Kernel: 7.2.2-pikaos (64-bit)
• Desktop Environment: KDE Plasma 6.7.4 (Wayland)
• CPU/iGPU: AMD Ryzen 5 7600X (Radeon Graphics)
• Motherboard: ASRock X670E Steel Legend
The Issue:
My monitor completely supports 4K (3840x2160) at 120Hz, and it works flawlessly at 120Hz on Windows 11. However, in PikaOS under KDE Plasma (Wayland), the maximum available refresh rate at 4K is strictly capped/hidden at 60Hz.
Diagnostic Details (kscreen-doctor -o output):
The system detects the connection via HDMI-A-1. The EDID modes parsed by the driver show 120Hz is only exposed at lower resolutions (1080p and 720p), while 4K is hard-limited to 60Hz:
Operating System
PikaOS
CPU
AMD Ryzen 5 7600X
GPU
RDNA 2
ROCm Version
Mesa version: 26.2.1
ROCm Component
No response
Steps to Reproduce
No response
(Optional for Linux users) Output of /opt/rocm/bin/rocminfo --support
rocminfo --support output
Paste output here
Additional Information
No response
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue on PikaOS with KDE Plasma Wayland and inspect the kscreen-doctor -o output for HDMI-A-1 and its EDID modes. The report provides no source file, test, or reproduction steps beyond the environment details; done means determining why 3840x2160 at 120Hz is not exposed and confirming the mode becomes available.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- linux
- Domain
- computer-graphics, operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100