Bug#1116527: nvidia-driver: Monitor doesn’t wake after suspend

[Mika Lauronen]

Package: nvidia-driver
Version: 550.163.01-2
Severity: normal

Dear Maintainer,

System Information:

OS: Debian 13 “Trixie” (fresh upgrade from Debian 12)
Driver Version: 550.163.01
Display Server: X11
Kernel: 6.12.48+deb13-amd64
Problem Description:
After upgrading from Debian 12 to Debian 13, monitors do not wake up after
suspend. The system appears to resume (fans spin up, lights come on) but
displays remain black and unresponsive.

Reproducible Steps:

Fresh Debian 13 installation with NVIDIA 550.163.01 drivers
Run sudo systemctl suspend
Wake system (keyboard/mouse/power button)
Result: Black screens, system appears hung
Key Finding:
Uninstalling NVIDIA drivers completely resolves the issue - suspend/resume
works perfectly with nouveau drivers.

Attempted Solutions (all failed):

Added nvidia.NVreg_PreserveVideoMemoryAllocations=1
Added nvidia.NVreg_EnableS0ixPowerManagement=1
Added nvidia.NVreg_EnableGpuFirmware=0
Enabled nvidia-suspend.service, nvidia-hibernate.service, 
nvidia-resume.service
Installed nvidia-suspend-common package
Expected Behavior:
Monitors should wake up properly after suspend, as they do with nouveau
drivers.

Additional Notes:
This appears to be a regression - suspend/resume worked fine on Debian 
12 with
earlier NVIDIA drivers. Issue persists with X11 (not Wayland-specific).

I will attach nvidia-bug-report.sh output if this helps with diagnosis.
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