[Bug 2085456] Re: Fix phantom monitor on some machines with kernel 6.11

This bug is awaiting verification that the linux-oem-6.11/6.11.0-1007.7
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-noble-linux-oem-6.11' to 'verification-done-
noble-linux-oem-6.11'. If the problem still exists, change the tag
'verification-needed-noble-linux-oem-6.11' to 'verification-failed-
noble-linux-oem-6.11'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-oem-6.11-v2 verification-needed-noble-linux-oem-6.11

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https://bugs.launchpad.net/bugs/2085456

Title:
Fix phantom monitor on some machines with kernel 6.11

Status in linux package in Ubuntu:
New
Status in linux-oem-6.11 package in Ubuntu:
New
Status in linux source package in Noble:
New
Status in linux-oem-6.11 source package in Noble:
Fix Committed
Status in linux source package in Oracular:
New
Status in linux-oem-6.11 source package in Oracular:
New
Status in linux source package in Plucky:
New
Status in linux-oem-6.11 source package in Plucky:
New

Bug description:
[SRU Justification]

[Impact]
There will be a confusing phantom monitor shown on the display list, but actually no extra monitor are connected.

[Fix]
The bug is caused by the commit https://github.com/torvalds/linux/commit/b49420d6a1aeb399e5b107fc6eb8584d0860fbd7 in 6.11. Needs to introduce the 6.12 fix https://github.com/torvalds/linux/commit/ad604f0a4c040dcb8faf44dc72db25e457c28076.

[Test Case]
1. Make sure no external monitor connected
2. Power on the particular machine
3. Issue the command on Terminal `DISPLAY=:0 xrandr -q`.
4. Check if there's a "Unknown 23" monitor" on the display list

[Where problems could occur]
Need to check on more machines with different configurations. It only happens on 6.11 and it only affects the SCREEN INFO displayed.

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