我为我的台式机买了一台 RTX 3070，但似乎无法让我的台式机使用它。它可以看到它，但watch nvidia-smi显示它已关闭
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 460.80 Driver Version: 460.80 CUDA Version: 11.2 |
|-------------------------------+----------------------+----------------------+
| 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 GeForce RTX 3070 Off | 00000000:01:00.0 On | N/A |
| 0% 39C P8 14W / 220W | 198MiB / 7972MiB | 2% Default |
| | | N/A |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=============================================================================|
| 0 N/A N/A 904 G /usr/lib/xorg/Xorg 35MiB |
| 0 N/A N/A 1484 G /usr/lib/xorg/Xorg 54MiB |
| 0 N/A N/A 1650 G /usr/bin/gnome-shell 74MiB |
| 0 N/A N/A 2218 G /usr/lib/firefox/firefox 3MiB |
| 0 N/A N/A 2421 G /usr/lib/firefox/firefox 3MiB |
| 0 N/A N/A 2465 G /usr/lib/firefox/firefox 3MiB |
| 0 N/A N/A 2571 G /usr/lib/firefox/firefox 3MiB |
| 0 N/A N/A 2607 G /usr/lib/firefox/firefox 3MiB |
| 0 N/A N/A 2971 G /usr/lib/firefox/firefox 3MiB |
+-----------------------------------------------------------------------------+
我正在使用已安装并启用的驱动程序 nvidia-driver-460（使用 GUI 完成）
此外，tensorflow 检测到 GPU，但执行简单的训练操作所花费的时间比应有的时间长得多（我安装了 cuDNN 和 CUDA 工具包），并且终端中显示的 GPU 上的负载根本没有增加。
据我所知，这是我唯一的 GPU，lspci | grep VGA仅返回01:00.0 VGA compatible controller: NVIDIA Corporation Device 2484 (rev a1)
附加信息：我正在使用 gdm3 并且已禁用 wayland
ubuntu-drivers devices
== /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 ==
modalias : pci:v000010DEd00002484sv00001462sd00003909bc03sc00i00
vendor : NVIDIA Corporation
driver : nvidia-driver-460 - distro non-free recommended
driver : nvidia-driver-465 - distro non-free
driver : nvidia-driver-460-server - distro non-free
driver : xserver-xorg-video-nouveau - distro free builtin
ubuntu-drivers list
nvidia-driver-465, (kernel modules provided by linux-modules-nvidia-465-generic-hwe-20.04)
nvidia-driver-460-server, (kernel modules provided by linux-modules-nvidia-460-server-generic-hwe-20.04)
nvidia-driver-460, (kernel modules provided by linux-modules-nvidia-460-generic-hwe-20.04)
cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.2 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.2 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
那么我怎样才能让我的桌面使用我的 GPU？
谢谢