so i use the xorg.conf to put the xorg service on the iGPU, after that, the 3080Ti stays high temp while idle.
(base) [dijin@dijin-ms7d16 ~]$ nvidia-smi
Thu Nov 18 23:20:31 2021
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 470.74 Driver Version: 470.74 CUDA Version: 11.4 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|===============================+======================+======================|
| 0 NVIDIA GeForce ... Off | 00000000:01:00.0 Off | N/A |
| 42% 57C P0 102W / 350W | 0MiB / 12053MiB | 0% Default |
| | | N/A |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=============================================================================|
| No running processes found |
+-----------------------------------------------------------------------------+
(base) [dijin@dijin-ms7d16 ~]$