I have an optimus laptop, and after the update to KDE6 optimus-manager stopped working. I needed a second display, and all my display outputs are on the Nvdia GPU, so I needed to switch. I tried many different X11 configs, envycontrol then more X11 configs, but I couldn’t get it working right, it would only be the internal display or the external one, not both. after a few hours I gave up and tried optimus-manager again. This time I checked the error log and it was failing to load the nvidia module, I tried loading it manually but I got a “No such device” error, which is where the title of the post comes in. My GPU has disappeared from linux, it won’t show up in lspci, lshw, nvidia-smi, or anything else it should. The only reference to the thing in dmesg I can find are :

[    0.216410] pci 0000:01:00.0: [10de:1ba1] type 00 class 0x030000
[    0.216419] pci 0000:01:00.0: reg 0x10: [mem 0xde000000-0xdeffffff]
[    0.216427] pci 0000:01:00.0: reg 0x14: [mem 0xc0000000-0xcfffffff 64bit pref]
[    0.216435] pci 0000:01:00.0: reg 0x1c: [mem 0xd0000000-0xd1ffffff 64bit pref]
[    0.216440] pci 0000:01:00.0: reg 0x24: [io  0xe000-0xe07f]
[    0.216445] pci 0000:01:00.0: reg 0x30: [mem 0xdf000000-0xdf07ffff pref]
[    0.216460] pci 0000:01:00.0: Enabling HDA controller
[    0.257300] pci 0000:01:00.0: vgaarb: bridge control possible
[    0.257300] pci 0000:01:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none
[    0.270521] pci 0000:01:00.1: D0 power state depends on 0000:01:00.0

and then nothing, it doesn’t even seem to try to load the nvidia module. I tried booting into windows and it shows up there fine, so the GPU didn’t randomly die.
As far as I can tell I’ve rolled back everything I did in my histfile until it stopped working, The only thing I could think is I upgraded my kernel to (6.7.9) from (6.6.10), could that have caused it? I also tried adding pcie_port_pm=off to the kernel params from the archwiki, but still nothing. I’m just at a loss here, anyone have any ideas?

EDIT: I’m using the nvidia-dkms package
EDIT2: one kernel downgrade later and it’s still not appearing, so thats not it.
EDIT3: fixed, see comments

  • @taazAEnglish
    3•1 month ago

    Could you show the output of ls -lah /sys/bus/pci/devices/0000:01:00.0/

    • Thomas DouwesOP
      4•1 month ago

      ls: cannot access '/sys/bus/pci/devices/0000:01:00.0': No such file or directory
      I also tried booting an archiso and the GPU appears there, there must be something wrong with my install.

      • @taazAEnglish
        4•1 month ago

        Good find, I would look into udev and modprobe (blacklists and stuff like that)

        • Thomas DouwesOP
          2•1 month ago

          I had a look at /etc/udev, /etc/modprobe.d and /etc/modules-load.d, and don’t see anything related to nvidia. Are there any more udev or blacklist folders to look at?

          • @taazAEnglish
            2•1 month ago

            Don’t remember other dirs, maybe some /usr/lib/… or /usr/share/… ?

            Could you try echo 1 > /sys/bus/pci/rescan and watch dmesg

            • Thomas DouwesOP
              2•1 month ago

              interesting, that did show the nvidia card in dmesg, still not in lspci though

              [ 1110.598286] pci 0000:01:00.0: [10de:1ba1] type 00 class 0x030000
[ 1110.598301] pci 0000:01:00.0: reg 0x10: [mem 0xde000000-0xdeffffff]
[ 1110.598310] pci 0000:01:00.0: reg 0x14: [mem 0xc0000000-0xcfffffff 64bit pref]
[ 1110.598318] pci 0000:01:00.0: reg 0x1c: [mem 0xd0000000-0xd1ffffff 64bit pref]
[ 1110.598324] pci 0000:01:00.0: reg 0x24: [io  0xe000-0xe07f]
[ 1110.598330] pci 0000:01:00.0: reg 0x30: [mem 0xdf000000-0xdf07ffff pref]
[ 1110.599069] pci 0000:01:00.0: vgaarb: bridge control possible
[ 1110.599073] pci 0000:01:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none
[ 1110.599078] i915 0000:00:02.0: vgaarb: VGA decodes changed: olddecodes=io+mem,decodes=none:owns=io+mem
[ 1110.599125] pci 0000:01:00.1: [10de:10f0] type 00 class 0x040300
[ 1110.599135] pci 0000:01:00.1: reg 0x10: [mem 0xdf080000-0xdf083fff]
[ 1110.599327] pci 0000:01:00.0: BAR 1: assigned [mem 0xc0000000-0xcfffffff 64bit pref]
[ 1110.599335] pci 0000:01:00.0: BAR 3: assigned [mem 0xd0000000-0xd1ffffff 64bit pref]
[ 1110.599341] pci 0000:01:00.0: BAR 0: assigned [mem 0xde000000-0xdeffffff]
[ 1110.599344] pci 0000:01:00.0: BAR 6: assigned [mem 0xdf000000-0xdf07ffff pref]
[ 1110.599347] pci 0000:01:00.1: BAR 0: assigned [mem 0xdf080000-0xdf083fff]
[ 1110.599349] pci 0000:01:00.0: BAR 5: assigned [io  0xe000-0xe07f]
[ 1110.599384] pci 0000:01:00.1: extending delay after power-on from D3hot to 20 msec
[ 1110.599418] pci 0000:01:00.1: D0 power state depends on 0000:01:00.0
[ 1110.599509] snd_hda_intel 0000:01:00.1: enabling device (0000 -> 0002)
[ 1110.599624] snd_hda_intel 0000:01:00.1: Disabling MSI
[ 1110.599630] snd_hda_intel 0000:01:00.1: Handle vga_switcheroo audio client
[ 1110.603829] i915 0000:00:02.0: vgaarb: VGA decodes changed: olddecodes=none,decodes=io+mem:owns=io+mem
[ 1110.628268] input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card2/input18
[ 1110.628341] input: HDA NVidia HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card2/input19
[ 1110.628403] input: HDA NVidia HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card2/input20
[ 1110.628464] input: HDA NVidia HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card2/input21