Public bug reported:
Hardware: AMD Radeon RX 6950 XT (Navi 21, 1002:73a5)
Monitor: Samsung CRG9, 5120x1440 @ 120 Hz via DisplayPort (requires DSC)
System: Ubuntu 24.04 (noble), kernel 6.8.0-137-generic
After upgrading linux-firmware from 20240318.git3b128b60-0ubuntu2.27
to ...-0ubuntu2.29, the right half of the display shows corruption
(solid red or vertical stripes, varying per boot). The same happens
on HDMI: the low-res boot framebuffer is fine, but the display goes
black once amdgpu loads. Windows on the same machine, cable and port
is unaffected.
No errors appear in dmesg. xrandr reports "link-status: Good", EDID
is parsed, and the mode is set. dmesg only shows
"[drm] DSC precompute is not needed."
The CRG9 is internally two 2560x1440 panel halves, which matches the
symptom: the second half receives no valid stream.
Downgrading to 20240318.git3b128b60-0ubuntu2.26 fixes the issue
completely. Note that 2.27 is no longer available in the archive.
Booting an older kernel (6.8.0-136) does NOT help, which points to
the firmware blobs rather than the kernel.
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
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Aug 15 23:07:30 2026
Dependencies: firmware-sof-signed 2023.12.1-1ubuntu1.11
InstallationDate: Installed on 2022-06-11 (1526 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
MachineType: Micro-Star International Co., Ltd. MS-7C35
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-137-generic
root=UUID=ec8e459a-3834-472f-abc5-e9fc26fed0ee 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: 08/11/2022
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: A.E0
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: MEG X570 UNIFY (MS-7C35)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 2.0
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: 2.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrA.E0:bd08/11/2022:br5.17:svnMicro-StarInternationalCo.,Ltd.:pnMS-7C35:pvr2.0:rvnMicro-StarInternationalCo.,Ltd.:rnMEGX570UNIFY(MS-7C35):rvr2.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr2.0:skuTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7C35
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 2.0
dmi.sys.vendor: Micro-Star International Co., Ltd.
** Affects: linux-firmware (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2163582
Title:
linux-firmware 2.29 breaks DSC on RDNA2: right half of 5120x1440
display corrupted
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