# HDMI 4K display corruption when switching from DisplayPort output

NVIDIA Open GPU Kernel Modules Version

595.45.04

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

Bazzite

Kernel Release

Linux bazzite 6.17.7-ba28.fc43.x86_64 #1 SMP PREEMPT_DYNAMIC Sun Mar 8 17:54:59 UTC 2026 x86_64 GNU/Linux

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

NVIDIA GeForce RTX 5080 (UUID: GPU-7b39252c-fa11-7943-0f27-75a357c4e753)

Describe the bug

When gamescope switches its preferred output from a DisplayPort connector to an HDMI connector, 4K (3840x2160) modes produce severe visual corruption on the HDMI display (a 4K TV). The image shows ghosting/doubling artifacts as if the display timings or pixel format are wrong.

Lower resolutions (1920x1080, 2560x1440) work correctly on the same HDMI output after the same DP-to-HDMI switch. 4K also works correctly on the HDMI output when:

• The system boots with ONLY the HDMI TV connected (no DP monitors)
• The system boots with HDMI as the primary display, DP monitors are connected afterward, and then switching back to HDMI

The issue ONLY occurs when the system boots on a DisplayPort output and then gamescope is restarted with --prefer-output {HDMI}.

To Reproduce

1. Connect a DisplayPort monitor and an HDMI 4K to the same RTX 5080 GPU
2. Boot the system with gamescope session on the DisplayPort output (--prefer-output {DP})
3. Change the OUTPUT_CONNECTOR environment variable to {HDMI}
4. Restart the gamescope session (via steamos-session-select gamescope which does systemctl restart sddm)
5. Observe: 4K output on the HDMI is corrupted with ghosting/doubling artifacts

Bug Incidence

Always

nvidia-bug-report.log.gz

nvidia-bug-report.log.gz

More Info

Tested variables (none of these fixed the 4K corruption)

What was tried	Result
Disable HDR (ENABLE_GAMESCOPE_HDR=0, removes --hdr-enabled)	Still corrupted at 4K
Force resolution (-W 3840 -H 2160)	Still corrupted
Force DRM mode generation (--generate-drm-mode fixed)	Still corrupted
DRM debugfs force cycle (echo off/on > .../{HDMI}//force)	Still corrupted
nvidia-modeset.hdmi_deepcolor=0 kernel param	No signal at all on HDMI
Lower resolution (-W 2560 -H 1440 or -W 1920 -H 1080)	Works correctly

DRM state during corruption

plane[51]: plane-0
        crtc=crtc-0
        fb=156
                allocated by = gamescope-xwm
                format=XB30 little-endian (0x30334258)   # 10-bit even without HDR flag
                size=3840x2160
        color-encoding=ITU-R BT.709 YCbCr
        color-range=YCbCr full range

Workaround

Setting a lower resolution (2560x1440 or 1920x1080) via gamescope's -W/-H flags produces a clean image on the HDMI after DP-to-HDMI switch. Only 4K (3840x2160) is affected.

Gamescope command line (with HDR disabled)

/usr/bin/gamescope --prefer-output HDMI-A-2 --xwayland-count 2 \
  --default-touch-mode 4 --hide-cursor-delay 3000 \
  --fade-out-duration 200 --steam

System info

• GPU: NVIDIA RTX 5080 (PCI 0000:01:00.0)
• Driver: 595.45.04 (open kernel modules)
• Connectors on Nvidia GPU: DP-2, DP-3, DP-4, HDMI-A-2
• TV: 4K HDMI 2.1 TV
• Monitor: 1920x1080 DisplayPort monitor
• Also present: AMD iGPU (0000:0c:00.0) with DP-1, HDMI-A-1 (not involved)

Bug Incidence

Always reproducible: 100% when switching from DP to HDMI at 4K. 0% at 1440p or lower. 0% when HDMI is the boot display.

Start by reviewing nvidia-bug-report.log.gz and reproducing the documented gamescope DP-to-HDMI switch on the RTX 5080 at 3840x2160. Compare DRM state and behavior with 1440p and with HDMI booted as the primary display; done means 4K HDMI remains corruption-free after the switch without regressing the working cases.