Public bug reported:
I have the same symptom as LP: #2060268. That is, I have a phantom
"Unknown Display" appear in Settings application, and there exists a dri
node for SimpleDRM.
$ ls -lh /dev/dri/by-path/
total 0
lrwxrwxrwx 1 root root 8 ธ.ค. 3 21:09 pci-0000:00:02.0-card -> ../card1
lrwxrwxrwx 1 root root 13 ธ.ค. 3 21:09 pci-0000:00:02.0-render ->
../renderD128
lrwxrwxrwx 1 root root 8 ธ.ค. 3 21:09 platform-simple-framebuffer.0-card ->
../card0
However, differently from the mentioned bug, this machine does NOT have
an Nvidia card, nor does it have the Nvidia driver installed. This
machine (which is a laptop) has an Intel integrated GPU, and seems to be
covered by i915 in-tree kernel driver.
`71-u-d-c-gpu-detection.rules` says that:
# Remove SimpleDRM device when nvidia-drm loads.
# This normally happens automatically for DRM devices that also register
# a framebuffer device, but that's not the case yet for the nvidia driver.
Which seems to imply that if a framebuffer device exist, SimpleDRM
device node should go away on its own. And on my machine, framebuffer
device do seem to exist (although, 2 of them?)
$ ls -lh /dev/fb*
crw-rw---- 1 root video 29, 0 ธ.ค. 3 21:09 /dev/fb0
crw-rw---- 1 root video 29, 1 ธ.ค. 3 21:09 /dev/fb1
Which is the reason I file this issue against Linux kernel.
Currently, I worked around the issue by adapting a rule from `71-u-d-c-
gpu-detection.rules` which remove the card0 node, but remove the
`DRIVERS=="nvidia"` clause from the rule.
This starts happening when I upgraded from Ubuntu 24.04 to 24.10 i.e.
this is a regression.
ProblemType: Bug
DistroRelease: Ubuntu 24.10
Package: linux-image-6.11.0-9-generic 6.11.0-9.9
ProcVersionSignature: Ubuntu 6.11.0-9.9-generic 6.11.0
Uname: Linux 6.11.0-9-generic x86_64
ApportVersion: 2.30.0-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/seq: peat 3644 F.... pipewire
/dev/snd/controlC0: peat 3644 F.... pipewire
peat 3653 F.... wireplumber
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Dec 4 12:15:43 2024
InstallationDate: Installed on 2024-07-23 (133 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Acer Swift SFG14-73
ProcEnviron:
LANG=th_TH.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB:
0 simpledrmdrmfb
1 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.11.0-9-generic
root=UUID=5a221c16-5c14-405a-bffc-61598efc4ed7 ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.11.0-9-generic N/A
linux-backports-modules-6.11.0-9-generic N/A
linux-firmware 20240913.gita34e7a5f-0ubuntu2
SourcePackage: linux
UpgradeStatus: Upgraded to oracular on 2024-11-03 (31 days ago)
dmi.bios.date: 08/25/2024
dmi.bios.release: 1.14
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.14
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Goldfish_MTH
dmi.board.vendor: MTL
dmi.board.version: V1.14
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 1.14
dmi.modalias:
dmi:bvnInsydeCorp.:bvrV1.14:bd08/25/2024:br1.14:efr1.14:svnAcer:pnSwiftSFG14-73:pvrV1.14:rvnMTL:rnGoldfish_MTH:rvrV1.14:cvnAcer:ct10:cvrChassisVersion:sku0000000000000000:
dmi.product.family: Swift Go 14
dmi.product.name: Swift SFG14-73
dmi.product.sku: 0000000000000000
dmi.product.version: V1.14
dmi.sys.vendor: Acer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oracular wayland-session
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https://bugs.launchpad.net/bugs/2090983
Title:
Phantom "Unknown Display" in Settings due to SimpleDRM dri node
appears on *Intel* GPU machine
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