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

> Like bug 2060268, this doesn't seem a kernel bug, more like a user
space issue.

I think it's the kernel DRM driver (i915) that's meant to evict
simpledrm. Either explicitly or implicitly. Or maybe simpledrm monitors
for new fbdev devices and removes itself when another one appears (as
alluded to in bug 2060268). The latter I should be able to test for and
confirm in the coming days...

The only reason bug 2060268 was solved in user space was because it was
Nvidia and we have no power to modify that driver.

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https://bugs.launchpad.net/bugs/2084046

Title:
[i915] Phantom "Unknown" display detected

Status in linux package in Ubuntu:
New

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)

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