[MUX Mode] RTX 5070 Ti Laptop (GB205): Internal eDP panel reports disconnected when NVIDIA drives display via MUX switch

[emptysoldier0-hue]

NVIDIA Open GPU Kernel Modules Version

595.58.03 (nvidia-open-dkms 595.58.03-2, Arch Linux AUR package)

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

Description: EndeavourOS Linux

Kernel Release

6.19.12-zen1-1-zen (zen kernel, custom build from linux-zen AUR package — not self-built)

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

GPU 0: NVIDIA GeForce RTX 5070 Ti Laptop GPU (UUID: GPU-c016d198-ada8-79d0-3117-b16847656a66)

Describe the bug

On the ASUS ROG Zephyrus G14 2025 (GA403WR) with RTX 5070 Ti Laptop GPU (GB205),
the internal eDP panel is not detected when the hardware MUX switch routes the display
through the NVIDIA GPU (gpu_mux_mode=0).

The connector card1-eDP-1 permanently reports disconnected in sysfs despite the panel
being physically present and functional. The internal display is dead from early boot.
External HDMI works correctly in MUX mode.

In Hybrid mode (gpu_mux_mode=1, AMD iGPU drives eDP), the internal display works
perfectly via card2-eDP-2.

Key diagnostic evidence:

• cat /sys/class/drm/card1-eDP-1/status → disconnected
• echo on > /sys/class/drm/card1-eDP-1/enabled has no effect
• Kernel logs: nvidia 0000:64:00.0: [drm] Cannot find any crtc or sizes
• ACPI firmware bug: ACPI(PEGP) defines _DOD but not _DOS (BIOS GA403WR.309)
• GSP firmware is loading correctly (NVreg_EnableGpuFirmware not disabled)
• nvidia-smi shows display_active: Enabled but eDP connector stays disconnected

To Reproduce

Preconditions:

• ASUS ROG Zephyrus G14 2025 (GA403WR), BIOS 309
• asusctl and supergfxd installed and running
• nvidia-open-dkms 595.58.03 loaded with nvidia_drm.modeset=1

Steps:

1. Ensure asusd is running: sudo systemctl start asusd
2. Switch to MUX mode: asusctl armoury set gpu_mux_mode 0
3. Reboot the system
4. After boot, confirm MUX mode: cat /sys/devices/platform/asus-nb-wmi/gpu_mux_mode (returns 0)
5. Check eDP connector status: cat /sys/class/drm/card1-eDP-1/status

Expected: connected
Actual: disconnected — internal display is completely dark

Bug Incidence

Always

nvidia-bug-report.log.gz

nvidia-bug-report.log.gz

More Info