[Bug 221897] New: [Regression] Half screen renders black with active cursor after upgrading to linux-firmware 20240318.git3b128b60-0ubuntu2.29

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221897

            Bug ID: 221897
           Summary: [Regression] Half screen renders black with active
                    cursor after upgrading to linux-firmware
                    20240318.git3b128b60-0ubuntu2.29
           Product: Drivers
           Version: 2.5
    Kernel Version: 7.0.0-29-generic
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: high
          Priority: P3
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: sylvain.mfalt@gmail.com
        Regression: Yes
           Bisected 20240318.git3b128b60-0ubuntu2.27 ->
         commit-id: 20240318.git3b128b60-0ubuntu2.29

Created attachment 310684
  --> https://bugzilla.kernel.org/attachment.cgi?id=310684&action=edit
half screen is black

Hi I used AI to cleanup my mess of a report here's what it gave me, the AI
added info I'm not familliar with but if that helps you I let it inside (the
plane thingy).

[Problem Description]
After updating linux-firmware to version 20240318.git3b128b60-0ubuntu2.29, the
right half of the primary monitor turns completely black (it was vertical lines
blue, green and black at some point too) upon booting into GNOME (Wayland). 
- Hardware failure ruled out: Live USB, BIOS, and software screenshots all
render normally.
- Software composition issue: The mouse cursor remains visible and moves freely
over the blacked-out region, indicating the hardware overlay plane receives
signal, but the desktop framebuffer fails to render on that panel region.

[Steps to Reproduce]
1. Boot Ubuntu 24.04 with linux-firmware version
20240318.git3b128b60-0ubuntu2.29.
2. Log into GNOME desktop session.
3. Observe half of the display panel dropping output to black.

[Bypass / Confirmed Fix]
Downgrading linux-firmware back to version 20240318.git3b128b60-0ubuntu2.27
immediately resolves the issue:
0. wget
https://snapshot.ubuntu.com/ubuntu/20260801T000000Z/pool/main/l/linux-firmware/linux-firmware_20240318.git3b128b60-0ubuntu2.27_amd64.deb
1. Installed linux-firmware_20240318.git3b128b60-0ubuntu2.27_amd64.deb.
2. Ran `sudo update-initramfs -u` and rebooted.
3. Full screen rendering restored instantly.

[hostnamectl]
Operating System: Ubuntu 24.04.4 LTS              
          Kernel: Linux 7.0.0-29-generic
    Architecture: x86-64
 Hardware Vendor: Gigabyte Technology Co., Ltd.
  Hardware Model: Z790 AORUS ELITE AX
Firmware Version: FC
   Firmware Date: Tue 2023-03-07
    Firmware Age: 3y 5month 1w 5d

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