add support of thunderbolt hotplug

NVIDIA Open GPU Kernel Modules Version

NVIDIA UNIX Open Kernel Mode Setting Driver for x86_64 570.144 Release Build (notroot@4edfd97358ec) Fri Apr 25 18:29:08 UTC 2025

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

CachyOS latest

Kernel Release

Linux cachyos 6.14.4-2-cachyos #1 SMP PREEMPT_DYNAMIC Fri, 25 Apr 2025 18:15:23 +0000 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

GPU 0: NVIDIA GeForce RTX 3060 (UUID: GPU-0fded5d6-1fad-c667-3302-31e117ab858a)

Describe the bug

I'm using dGPU with thunderbolt 3 case. The main issue that during sleep/suspend or reconnecting device kernel module goes to "fallen off the bus" mode, without reconnecting. Any usage of device is not possible until reboot.

Hotplug works on Windows btw.

To Reproduce

Disconnect dGPU via thunderbolt and connect again

Bug Incidence

Always

nvidia-bug-report.log.gz

nvidia-bug-report.log.gz

More Info

No response

Start by reproducing the Thunderbolt disconnect and reconnect cycle described in the issue and inspect the attached nvidia-bug-report.log.gz. Done means the open kernel module recovers from suspend or Thunderbolt reconnection without entering “fallen off the bus” state or requiring a reboot.