[Bug 2084046] Re: [i915] Phantom "Unknown" display detected

I have the same problem.

I bought a ThinkPad T14 gen 5 in May this year. Worked perfectly with
Noble, but now, after the evil Oracular Oriole has eaten the nice cute
Numbats, I got the ghost screen as described in this bug report. This is
very disturbing, starting from the mouse pointer not stopping at the
right border of the screen as there is the ghost desktop where it
enters, also having windows extending into that area or even completely
getting lost there. And when I wanted to give a talk on a conference 3
weeks ago I had major difficulties with the projector, especially I
cannot switch the "Mirror" mode, probably due to having 3 and not only 2
screens. I need "Mirror" to see my slides on my laptop on the podium
while they are also on the projection screen, so that I do not need to
look behind me all the time.

My specifications:

All Intel, no NVidia, no AMD

- # System Details Report
---

## Report details
- **Date generated:** 2024-10-30 14:51:47

## Hardware Information:
- **Hardware Model:** Lenovo ThinkPad T14 Gen 5
- **Memory:** 64.0 GiB
- **Processor:** Intel® Core™ Ultra 7 155U × 14
- **Graphics:** Intel® Graphics (MTL)
- **Disk Capacity:** 2.0 TB

## Software Information:
- **Firmware Version:** N47ET19W (1.08 )
- **OS Name:** Ubuntu 24.10
- **OS Build:** (null)
- **OS Type:** 64-bit
- **GNOME Version:** 47
- **Windowing System:** Wayland
- **Kernel Version:** Linux 6.11.0-9-generic

$ cat /sys/class/drm/card1/device/uevent
DRIVER=i915
PCI_CLASS=30000
PCI_ID=8086:7D45
PCI_SUBSYS_ID=17AA:2327
PCI_SLOT_NAME=0000:00:02.0
MODALIAS=pci:v00008086d00007D45sv000017AAsd00002327bc03sc00i00

$ cat /sys/class/drm/card0/device/uevent
DRIVER=simple-framebuffer
MODALIAS=platform:simple-framebuffer

$ ls /sys/class/drm/
card0/ card1-DP-1/ card1-DP-4/ renderD128/
card0-Unknown-1/ card1-DP-2/ card1-eDP-1/ version
card1/ card1-DP-3/ card1-HDMI-A-1/

I am on the Engineering Sprint in the Desktop Team room this week, if
somebody wants to have a look.

--
You received this bug notification because you are subscribed to linux
in Ubuntu.
Matching subscriptions: Bgg, Bmail, Nb
https://bugs.launchpad.net/bugs/2084046

Title:
[i915] Phantom "Unknown" display detected

Status in linux package in Ubuntu:
Confirmed

Bug description:
Settings is reporting a second display ("Unknown") is connected. This
is on a laptop which has nothing plugged in and only an Intel GPU.

It appears the problem is once again (like bug 2060268) SimpleDRM:

Node: /dev/dri/card0
├───Driver: simpledrm (DRM driver for simple-framebuffer platform devices) version 1.0.0 (0)
--
Node: /dev/dri/card1
├───Driver: i915 (Intel Graphics) version 1.6.0 (0)

Linux version 6.11.0-8-generic (buildd@lcy02-amd64-042) (x86_64-linux-
gnu-gcc-14 (Ubuntu 14.2.0-4ubuntu2) 14.2.0, GNU ld (GNU Binutils for
Ubuntu) 2.43.1) #8-Ubuntu SMP PREEMPT_DYNAMIC Mon Sep 16 13:41:20 UTC
2024 (Ubuntu 6.11.0-8.8-generic 6.11.0)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2084046/+subscriptions