Public bug reported:
Ubuntu 24.04.4 LTS, AMD Navi 21 / RX 6800-class GPU.
System worked normally before the linux-firmware update on 2026-08-11
23:44, when 20240318.git3b128b60-0ubuntu2.27 was upgraded to
20240318.git3b128b60-0ubuntu2.29.
With .29, the display has an exact half-screen region of vertical
corruption; the mouse cursor remains correctly rendered above the
corruption. It reproduces with a single HDMI monitor, so it is not
dependent on DisplayPort or a three-monitor configuration. The
corruption also follows the active monitor rather than one physical
monitor/output.
Both 6.8.0-137-generic and 7.0.0-28-generic reproduce the problem with
.29. amdgpu.dcdebugmask=0x1 removes the half-screen corruption with
fewer displays, but enabling the third monitor then causes all displays
to go black; 0x41 prevents the graphical login from appearing with three
monitors. Recovery/nomodeset displays correctly.
Downgrading only linux-firmware to 20240318.git3b128b60-0ubuntu2.26,
rebuilding initramfs and returning to normal AMDGPU settings makes the
original three-monitor setup work again. No kernel/Mesa downgrade was
necessary.
Regression:
GOOD:
Ubuntu 24.04.4
kernel 6.8.0-137-generic
linux-firmware 20240318.git3b128b60-0ubuntu2.26
3 monitors
normal amdgpu configuration
=> works correctly
BAD:
Ubuntu 24.04.4
kernel 6.8.0-137-generic
linux-firmware 20240318.git3b128b60-0ubuntu2.29
=> half-screen display corruption
BAD:
Ubuntu 24.04.4
kernel 7.0.0-28-generic
linux-firmware 20240318.git3b128b60-0ubuntu2.29
=> same corruption
Therefore the regression follows the linux-firmware version
rather than the tested kernel version.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-firmware 20240318.git3b128b60-0ubuntu2.26
ProcVersionSignature: Ubuntu 6.8.0-137.137-generic 6.8.12
Uname: Linux 6.8.0-137-generic x86_64
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: Regolith:GNOME-Flashback:GNOME
Date: Wed Aug 12 10:37:59 2026
Dependencies: firmware-sof-signed 2023.12.1-1ubuntu1.11
InstallationDate: Installed on 2022-06-19 (1515 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
MachineType: Micro-Star International Co., Ltd. MS-7C95
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-137-generic
root=UUID=515405b8-ecf6-4cf5-9820-3c1621b18748 ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.8.0-137-generic N/A
linux-backports-modules-6.8.0-137-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.26
SourcePackage: linux-firmware
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/26/2021
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: 2.71
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: B550M PRO-VDH WIFI (MS-7C95)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 1.0
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvr2.71:bd02/26/2021:br5.17:svnMicro-StarInternationalCo.,Ltd.:pnMS-7C95:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnB550MPRO-VDHWIFI(MS-7C95):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:skuTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7C95
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.
** Affects: linux-firmware (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
** Attachment added: "gpu.txt"
https://bugs.launchpad.net/bugs/2163303/+attachment/5991464/+files/gpu.txt
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https://bugs.launchpad.net/bugs/2163303
Title:
[regression] linux-firmware 20240318.git3b128b60-0ubuntu2.29 causes
half-screen corruption/black screens on AMD Navi 21; 0ubuntu2.26 works
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