昨天我注意到一些针对 nvidia 的软件更新，一切就这么开始了。软件更新程序没有给出任何错误，但几个小时后，当我尝试打开 CS:GO 时，帧率只有 40 fps，这与平常相差甚远。正如我所怀疑的那样，nvidia 卡被禁用了。从那时起，我几乎尝试了所有方法，下面是一些图像和命令输出：
$ prime-select query
nvidia
$ dkms status
bcmwl, 6.30.223.271+bdcom, 5.3.0-40-generic, x86_64: installed (WARNING! Diff between built and installed module!)
nvidia, 440.64, 5.3.0-40-generic, x86_64: installed
$ lspci -k | grep -A 2 -E "(VGA|3D)"
00:02.0 VGA compatible controller: Intel Corporation Device 3e9b
Subsystem: Micro-Star International Co., Ltd. [MSI] Device 127e
Kernel driver in use: i915
--
01:00.0 3D controller: NVIDIA Corporation Device 1f91 (rev a1)
Subsystem: Micro-Star International Co., Ltd. [MSI] Device 127e
Kernel driver in use: nvidia
$ echo $XDG_SESSION_TYPE
x11
$ lsmod | grep nvidia
nvidia_uvm 942080 0
nvidia_drm 49152 0
nvidia_modeset 1114112 1 nvidia_drm
nvidia 20426752 2 nvidia_uvm,nvidia_modeset
drm_kms_helper 180224 2 nvidia_drm,i915
drm 491520 17 drm_kms_helper,nvidia_drm,i915
ipmi_msghandler 102400 2 ipmi_devintf,nvidia
$ dpkg -l | grep nvidia
ii libnvidia-cfg1-440:amd64 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA binary OpenGL/GLX configuration library
ii libnvidia-common-440 440.64-0ubuntu0~0.18.04.1 all Shared files used by the NVIDIA libraries
ii libnvidia-compute-440:amd64 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA libcompute package
ii libnvidia-compute-440:i386 440.64-0ubuntu0~0.18.04.1 i386 NVIDIA libcompute package
ii libnvidia-decode-440:amd64 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA Video Decoding runtime libraries
ii libnvidia-decode-440:i386 440.64-0ubuntu0~0.18.04.1 i386 NVIDIA Video Decoding runtime libraries
ii libnvidia-encode-440:amd64 440.64-0ubuntu0~0.18.04.1 amd64 NVENC Video Encoding runtime library
ii libnvidia-encode-440:i386 440.64-0ubuntu0~0.18.04.1 i386 NVENC Video Encoding runtime library
ii libnvidia-fbc1-440:amd64 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA OpenGL-based Framebuffer Capture runtime library
ii libnvidia-fbc1-440:i386 440.64-0ubuntu0~0.18.04.1 i386 NVIDIA OpenGL-based Framebuffer Capture runtime library
ii libnvidia-gl-440:amd64 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and Vulkan ICD
ii libnvidia-gl-440:i386 440.64-0ubuntu0~0.18.04.1 i386 NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and Vulkan ICD
ii libnvidia-ifr1-440:amd64 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA OpenGL-based Inband Frame Readback runtime library
ii libnvidia-ifr1-440:i386 440.64-0ubuntu0~0.18.04.1 i386 NVIDIA OpenGL-based Inband Frame Readback runtime library
ii nvidia-compute-utils-440 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA compute utilities
ii nvidia-dkms-440 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA DKMS package
ii nvidia-driver-440 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA driver metapackage
ii nvidia-kernel-common-440 440.64-0ubuntu0~0.18.04.1 amd64 Shared files used with the kernel module
ii nvidia-kernel-source-440 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA kernel source package
ii nvidia-prime 0.8.8.2 all Tools to enable NVIDIAs Prime
ii nvidia-settings 440.44-0ubuntu0.18.04.1 amd64 Tool for configuring the NVIDIA graphics driver
ii nvidia-utils-440 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA driver support binaries
ii xserver-xorg-video-nvidia-440 440.64-0ubuntu0~0.18.04.1 amd64 NVIDIA binary Xorg driver
$ nvidia-smi
Sun Mar 8 12:16:19 2020
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 440.64 Driver Version: 440.64 CUDA Version: 10.2 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 165... Off | 00000000:01:00.0 Off | N/A |
| N/A 40C P0 5W / N/A | 0MiB / 3911MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| No running processes found |
+-----------------------------------------------------------------------------+
$ mokutil --sb-state
SecureBoot disabled
$ glxinfo | grep OpenGL
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) UHD Graphics 630 (Coffeelake 3x8 GT2)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 19.2.8
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 19.2.8
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.2 Mesa 19.2.8
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
OpenGL ES profile extensions:
我还注意到，每当我运行prime-select intel/nvidia，我都会得到这个输出：
Failed to enable/disable unit: Unit file nvidia-fallback.service does not exist.
除了重新安装 Ubuntu 之外，我不知道还能做什么，所以如果能得到任何帮助，我将不胜感激。如果您需要更多信息，请告诉我。
编辑：感谢您的帮助，但最终我厌倦了驱动程序无法正常工作，所以我刚刚安装了 Ubuntu 19.10。有趣的是，上次我遇到了一些驱动程序无法正常工作的问题，但现在它们开箱即用。
答案1
尝试
sudo apt purge nvidia*
（在没有与 nvidia* 匹配的文件的目录中执行此操作，您希望 apt 删除与 nvidia 相关的所有内容）
并通过附加硬件向导重新安装 nvidia 驱动程序。
缺少的后备服务将导致 prime-select 停止工作。