Jtdcftul

A while ago, I added the graphics-drivers PPA and installed the 415 driver. I decided to go back to my original driver, the 390, but seemingly made a mistake in doing so - I removed the PPA before switching. When I tried to switch from the 415 to the 390, I got an error message (I don't recall the exact message, but it mentioned cache).

When using the 390 driver, I cannot have NVIDIA prime-selected. If I do, I find that:

• My system cannot cannot boot to the desktop properly, instead getting stuck in a short cycle between the Ubuntu loading logo and a terminal flooded with the following, repeated over and over:

Starting NVIDIA persistence daemon

Stopping NVIDIA persistence daemon

• Use of certain NVIDIA tools causes the screen to hang. For example, if I use nvidia-settings, the screen freezes. If I use nvidia-bug-report.sh, the system freezes having only generated the following nvidia-bug-report.log.gz:

.

____________________________________________



Start of NVIDIA bug report log file.  Please include this file, along

with a detailed description of your problem, when reporting a graphics

driver bug via the NVIDIA Linux forum (see devtalk.nvidia.com)

or by sending email to 'linux-bugs@nvidia.com'.



nvidia-bug-report.sh Version: 23805530



Date: Wed 27 Feb 02:08:52 GMT 2019

uname: Linux u-rdm 4.18.0-15-generic #16~18.04.1-Ubuntu SMP Thu Feb 7 14:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

command line flags: 

When I run lspci -v, the graphics related entries seem to be the following:

00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07) (prog-if 00 [VGA controller])

    Subsystem: Dell UHD Graphics 620

    Flags: bus master, fast devsel, latency 0, IRQ 130

    Memory at d4000000 (64-bit, non-prefetchable) [size=16M]

    Memory at b0000000 (64-bit, prefetchable) [size=256M]

    I/O ports at f000 [size=64]

    [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]

    Capabilities: <access denied>

    Kernel driver in use: i915

    Kernel modules: i915



01:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940MX] (rev a2)

    Subsystem: Dell GM108M [GeForce 940MX]

    Flags: bus master, fast devsel, latency 0, IRQ 142

    Memory at d2000000 (32-bit, non-prefetchable) [size=16M]

    Memory at c0000000 (64-bit, prefetchable) [size=256M]

    Memory at d0000000 (64-bit, prefetchable) [size=32M]

    I/O ports at e000 [size=128]

    Expansion ROM at d3000000 [disabled] [size=512K]

    Capabilities: <access denied>

    Kernel driver in use: nouveau

    Kernel modules: nvidiafb, nouveau

If I run glxinfo, there is no reference to NVIDIA. It seems to go with the integrated graphics:

OpenGL vendor string: Intel Open Source Technology Center

OpenGL renderer string: Mesa DRI Intel(R) UHD Graphics 620 (Kabylake GT2) 

When the issue first occured, I recall trying to purge and re-install the NVIDIA packages, to no avail.

I notice that, running lsmod, there is no appearance of the nvidiafb module mentioned by lspci. Also, running modprobe nvidia yields the following:

modprobe: FATAL: Module nvidia not found in directory /lib/modules/4.18.0-15-generic

Currently, dpkg -l | grep nvidia gives me the following output:

ii  libnvidia-common-390                       390.87-0ubuntu0~gpu18.04.2                   all          Shared files used by the NVIDIA libraries

rc  libnvidia-compute-390:amd64                390.87-0ubuntu0~gpu18.04.2                   amd64        NVIDIA libcompute package

ii  libnvidia-compute-390:i386                 390.87-0ubuntu0~gpu18.04.2                   i386         NVIDIA libcompute package

ii  libnvidia-decode-390:i386                  390.87-0ubuntu0~gpu18.04.2                   i386         NVIDIA Video Decoding runtime libraries

ii  libnvidia-encode-390:i386                  390.87-0ubuntu0~gpu18.04.2                   i386         NVENC Video Encoding runtime library

ii  libnvidia-fbc1-390:i386                    390.87-0ubuntu0~gpu18.04.2                   i386         NVIDIA OpenGL-based Framebuffer Capture runtime library

ii  libnvidia-gl-390:i386                      390.87-0ubuntu0~gpu18.04.2                   i386         NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and Vulkan ICD

ii  libnvidia-ifr1-390:i386                    390.87-0ubuntu0~gpu18.04.2                   i386         NVIDIA OpenGL-based Inband Frame Readback runtime library

rc  nvidia-compute-utils-390                   390.87-0ubuntu0~gpu18.04.2                   amd64        NVIDIA compute utilities

rc  nvidia-dkms-390                            390.87-0ubuntu0~gpu18.04.2                   amd64        NVIDIA DKMS package

ii  nvidia-kernel-common-390                   390.87-0ubuntu0~gpu18.04.2                   amd64        Shared files used with the kernel module

ii  nvidia-prime                               0.8.8.2                                      all          Tools to enable NVIDIA's Prime

ii  nvidia-settings                            415.27-0ubuntu0~gpu18.04.1                   amd64        Tool for configuring the NVIDIA graphics driver