DP-1 4K monitor limited to 29.98Hz on RTX 5070 Ti (Blackwell) with nvidia-open 595.84

NVIDIA Open GPU Kernel Modules Version

Driver: 595.84 (nvidia-open, MIT/GPL)

Please confirm this issue does not happen with the proprietary driver (of the same version). This issue tracker is only for bugs specific to the open kernel driver.

• I confirm that this does not happen with the proprietary driver package.

Operating System and Version

Ubuntu 26.04

Kernel Release

Kernel: 7.0.0-27-generic

Please confirm you are running a stable release kernel (e.g. not a -rc). We do not accept bug reports for unreleased kernels.

• I am running on a stable kernel release.

Hardware: GPU

RTX 5070 Ti (Blackwell GB203)

Describe the bug

DisplayPort 4K monitor limited to 29.98Hz on RTX 5070 Ti (Blackwell)
Description
DP-1 (AOC U28G2G6B 28" 4K) is limited to 29.98Hz. EDID has 60Hz mode but only 29.98Hz is exposed. HDMI-1 (U32G4ZMN) works at 120Hz fine. Windows works fine.

Driver: 595.84 (nvidia-open, MIT/GPL) GPU: RTX 5070 Ti (Blackwell GB203) OS: Ubuntu 26.04, Wayland only, GNOME 50.1 Kernel: 7.0.0-27-generic

Evidence
wayland-info shows DP-1 has only one mode: mode: 3840×2160 @ 29.980 Hz, flags: current preferred

EDID confirms 60Hz exists:
DTD 1: 3840x2160 59.996625 Hz VIC 97: 3840x2160 60.000 Hz Maximum Refresh Rate: 60 Hz

What was tried (all failed)
OSD DP version already 1.2
video=DP-1:3840x2160@60 kernel param — no effect
Edited monitors.xml — GNOME overwrites on login
X11 not available (Ubuntu 26.04 Wayland-only)
Closed-source module can't bind (Blackwell requires open module)

To Reproduce

Install nvidia-open 595.84 on Ubuntu 26.04 (Wayland only)
Connect 4K monitor (AOC U28G2G6B) to RTX 5070 Ti via DisplayPort
Boot and log into GNOME Wayland session
Run: wayland-info | grep -A10 "DP-1"
Observe that only 3840x2160 @ 29.980 Hz is available
The display settings GUI also shows max 29.98Hz refresh rate

Bug Incidence

Always

nvidia-bug-report.log.gz

nvidia-bug-report.log.gz

More Info

No response

Start by reviewing nvidia-bug-report.log.gz and reproducing the issue with wayland-info on DP-1 under GNOME Wayland. Trace the display-mode handling for the RTX 5070 Ti and compare the exposed modes with the EDID; done means the 3840×2160 @ 60 Hz mode is available without breaking the existing HDMI mode.