Public bug reported:
Hardware:
- GPU: ASUS Radeon RX 7900 XTX (Navi 31, DCN32), PCIe Gen4 x16, ReBAR on
- CPU: Ryzen 7 5800X (stock), Board: ASUS ROG Strix B550-A
- Display: single monitor, 59.95 Hz, VRR off
Software:
- Ubuntu 26.04, GNOME Wayland
- Kernel 7.0.0-38-generic (affected)
- Mesa 26.0.8-1ubuntu0.3, linux-firmware 20260319.git217ca6e4
- DMCUB 0x07002f00, SMU 78.131.0
Symptom:
Brief horizontal bands of small brightly colored blocks across several
windows, lasting about one frame. Triggered by cursor movement, opening
the GNOME overview, and full CPU load (stress-ng). Not visible in GNOME
screen recordings (the recording stutters at the moment of a blink), so
the corruption appears to occur at scanout, not in rendering.
Results:
- Mainline 6.19.14 on the same Ubuntu install: no blinks (regression)
- Fedora 44 live (6.19.10), GNOME and KDE: no blinks
- Text console (Ctrl+Alt+F3) with stress-ng: no blinks
- Also occurs on a projector via HDMI and on all DP ports -> not monitor/cable
- Not affected by: VRR off, CPU/RAM at stock, memory clock locked to
max (pp_dpm_mclk), hardware cursor disabled
(MUTTER_DEBUG_DISABLE_HW_CURSORS=1),
amdgpu.dcdebugmask=0x42, either VBIOS position
- dmesg shows no errors
- Ubuntu 7.0.0-30-generic: no blinks -> regression between 7.0.0-30 and 7.0.0-38
Video and dmesg attached.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-38-generic 7.0.0-38.38
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: lgross 4016 F.... wireplumber
/dev/snd/controlC0: lgross 4016 F.... wireplumber
/dev/snd/seq: lgross 3997 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 21 13:27:54 2026
InstallationDate: Installed on 2026-10-09 (12 days ago)
InstallationMedia: Ubuntu 26.04.1 LTS "Resolute Raccoon" - Release amd64
(20260826)
MachineType: ASUS System Product Name
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-38-generic
root=UUID=442e458a-fa04-44b3-882d-018bba63cbd9 ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/10/2026
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3645
dmi.board.asset.tag: Default string
dmi.board.name: ROG STRIX B550-A GAMING
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr3645:bd09/10/2026:br5.17:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXB550-AGAMING:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:pfaTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: ASUS
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "slow-mo video of the error"
https://bugs.launchpad.net/bugs/2171609/+attachment/6011247/+files/IMG_1138.mov
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2171609
Title:
[amdgpu] RX 7900 XTX: single-frame colored block bands since 7.0.0-38
(7.0.0-30 not affected)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2171609/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
