[Bug 2084046] Re: [i915] Phantom "Unknown" display detected on Intel Meteor Lake

Hi Justus,

Thanks for testing. We now know the fix, which is great news.

We just need to get it out to everyone now.

I see the Kernel Team has just tagged 6.8.0-52-generic, but
"firmware/sysfb: Disable sysfb for firmware buffers with unknown parent"
isn't in there. It looks like it might be a part of the next SRU cycle
instead.

ubuntu-noble$ git log --grep "firmware/sysfb: Disable sysfb for firmware buffers with unknown parent" origin/master-next
commit 4f3ddc70111bd257bf9fbdfe43cd58d9fb67d72c
Author: Thomas Zimmermann <tzimmermann@suse.de>
Date: Tue Sep 24 10:41:03 2024 +0200

firmware/sysfb: Disable sysfb for firmware buffers with unknown parent
ubuntu-noble$ git describe --contains 4f3ddc70111bd257bf9fbdfe43cd58d9fb67d72c
fatal: cannot describe '4f3ddc70111bd257bf9fbdfe43cd58d9fb67d72c'
$ git log --grep "firmware/sysfb: Disable sysfb for firmware buffers with unknown parent" Ubuntu-6.8.0-52.53
(nothing)

I'll see what I can do. Worst case, it will be approx 2 months away.

Thanks,
Matthew

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

Title:
[i915] Phantom "Unknown" display detected on Intel Meteor Lake

Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Noble:
Fix Committed
Status in linux source package in Oracular:
Fix Committed

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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