Public bug reported:
Problem Description:
After updating to kernel 7.0.0-34-generic, specific applications (specifically
Chromium/Electron-based apps with hardware acceleration enabled) experience
severe window flickering, blanking, and intermittent black screens during
redraws. The desktop shell remains responsive, but the client window contents
intermittently fail to present or render black frames.
Hardware & Environment Information:
- Host: Toshiba Satellite S855
- Kernel: 7.0.0-34-generic
- Display Server: Wayland (echo $XDG_SESSION_TYPE -> wayland)
- GPU: AMD/ATI Thames [Radeon HD 7500M/7600M Series] (Radeon HD 7670M)
[1002:6840] (rev ff)
- Subsystem: Toshiba Corporation [1179:fb22]
- Active Driver: radeon (DRM 2.51.0 / KMS Turks)
Relevant dmesg / DRM logs:
[drm] radeon kernel modesetting enabled.
[drm] initializing kernel modesetting (TURKS 0x1002:0x6840 0x1179:0xFB22 0x00).
[drm] Detected VRAM RAM=2048M, BAR=256M
[drm] Loading TURKS Microcode
radeon 0000:01:00.0: [drm] PCIE GART of 1024M enabled.
radeon 0000:01:00.0: [drm] fb0: radeondrmfb frame buffer device
Steps to Reproduce:
1. Boot with kernel 7.0.0-34-generic into a default Wayland session.
2. Launch a hardware-accelerated application (e.g., Google Chrome, Gemini
PWA/Electron, VS Code).
3. Interact with the window or hover over UI elements.
4. The window content rapidly flickers between the rendered page and solid
black.
Expected Behavior:
Window surfaces should redraw cleanly without buffer flickering or black frames
under the legacy radeon KMS driver.
Observed Behavior:
Window rendering intermittently collapses to a black surface during buffer
swaps under Wayland.
Regression:
This issue was introduced with the recent kernel update.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-34-generic 7.0.0-34.34
ProcVersionSignature: Ubuntu 7.0.0-34.34-generic 7.0.14
Uname: Linux 7.0.0-34-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: daby 4597 F.... wireplumber
/dev/snd/controlC1: daby 4597 F.... wireplumber
/dev/snd/seq: daby 4581 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 30 17:17:42 2026
InstallationDate: Installed on 2025-02-25 (583 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
IwDevWlp8s0Link: Not connected.
MachineType: TOSHIBA Satellite S855
ProcEnviron:
LANG=es_ES.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-34-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2013
dmi.bios.release: 6.70
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: 6.70
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: MP
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis Manufacturer
dmi.chassis.version: OEM Chassis Version
dmi.ec.firmware.release: 6.20
dmi.modalias:
dmi:bvnInsydeCorp.:bvr6.70:bd04/15/2013:br6.70:efr6.20:svnTOSHIBA:pnSatelliteS855:pvrPSKFWU-002002:rvnTOSHIBA:rnPortablePC:rvrMP:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:skuPSKFWU:pfaDakar10F/FG:
dmi.product.family: Dakar 10F/FG
dmi.product.name: Satellite S855
dmi.product.sku: PSKFWU
dmi.product.version: PSKFWU-002002
dmi.sys.vendor: TOSHIBA
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "daby@daby-Satellite-S855:~$ uname -a Linux
daby-Satellite-S855 7.0.0-34-generic #34-Ubuntu SMP PREEMPT_DYNAMIC Wed Sep 2
14:29:37 UTC 2026 x86_64 GNU/Linux daby@daby-Satellite-S855:~$ uname -r
7.0.0-34-generic daby@daby-Satellite-S855:~$ ubuntu-bug linux REDACTED config
part /etc/cloud/cloud.cfg.d/99-installer.cfg, insufficient permissions REDACTED
config part /etc/cloud/cloud.cfg.d/90-installer-network.cfg, insufficient
permissions daby@daby-Satellite-S855:~$ Se está abriendo en una sesión de
navegador existente. daby@daby-Satellite-S855:~$ ubuntu-bug linux REDACTED
config part /etc/cloud/cloud.cfg.d/99-installer.cfg, insufficient permissions
REDACTED config part /etc/cloud/cloud.cfg.d/90-installer-network.cfg,
insufficient permissions Error executing command as another user: Request
dismissed daby@daby-Satellite-S855:~$ uname -r 7.0.0-34-generic
daby@daby-Satellite-S855:~$ echo $XDG_SESSION_TYPE wayland
daby@daby-Satellite-S855:~$ lspci -nnk | grep -iA3 'vga\|3d\|display' 01:00.0
VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Thames
[Radeon HD 7500M/7600M Series] [1002:6840] Subsystem: Toshiba Corporation
Radeon HD 7670M [1179:fb22] Kernel driver in use: radeon Kernel
modules: radeon, amdgpu daby@daby-Satellite-S855:~$ sudo dmesg | grep -Ei
"drm|i915|amdgpu|nouveau|gpu" [sudo: authenticate] Contraseña: [
0.730379] ACPI: bus type drm_connector registered [ 0.748985]
simple-framebuffer simple-framebuffer.0: [drm] Registered 1 planes with drm
panic [ 0.749012] [drm] Initialized simpledrm 1.0.0 for simple-framebuffer.0
on minor 0 [ 0.749949] simple-framebuffer simple-framebuffer.0: [drm] fb0:
simpledrmdrmfb frame buffer device [ 1.597125] ata1.00: supports DRM
functions and may not be fully accessible [ 1.602012] ata1.00: supports DRM
functions and may not be fully accessible [ 4.040860] systemd[1]:
[email protected] - Load Kernel Module drm skipped, unmet condition check
ConditionKernelModuleLoaded=!drm [ 9.002961] amdgpu: Virtual CRAT table
created for CPU [ 9.002992] amdgpu: Topology: Add CPU node [ 9.075680]
[drm] radeon kernel modesetting enabled. [ 9.128881] [drm] initializing
kernel modesetting (TURKS 0x1002:0x6840 0x1179:0xFB22 0x00). [ 9.129055]
[drm] Detected VRAM RAM=2048M, BAR=256M [ 9.129056] [drm] RAM width 128bits
DDR [ 9.129244] [drm] radeon: 2048M of VRAM memory ready [ 9.129248]
[drm] radeon: 1024M of GTT memory ready. [ 9.129262] [drm] Loading TURKS
Microcode [ 9.136561] [drm] Internal thermal controller with fan control [
9.138666] [drm] radeon: dpm initialized [ 9.141687] [drm] GART: num cpu
pages 262144, num gpu pages 262144 [ 9.142367] radeon 0000:01:00.0: [drm]
enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0 [ 9.161641]
radeon 0000:01:00.0: [drm] PCIE GART of 1024M enabled (table at
0x0000000000162000). [ 9.161751] radeon 0000:01:00.0: fence driver on ring 0
uses gpu addr 0x0000000080000c00 [ 9.161754] radeon 0000:01:00.0: fence
driver on ring 3 uses gpu addr 0x0000000080000c0c [ 9.162156] radeon
0000:01:00.0: fence driver on ring 5 uses gpu addr 0x0000000000072118 [
9.162598] [drm] radeon: irq initialized. [ 9.178992] [drm] ring test on 0
succeeded in 1 usecs [ 9.179005] [drm] ring test on 3 succeeded in 4 usecs [
9.356405] radeon 0000:01:00.0: [drm] ring test on 5 succeeded in 2 usecs [
9.356422] radeon 0000:01:00.0: [drm] UVD initialized successfully. [
9.356580] [drm] ib test on ring 0 succeeded in 0 usecs [ 9.356646] [drm] ib
test on ring 3 succeeded in 0 usecs [ 10.029669] radeon 0000:01:00.0: [drm]
ib test on ring 5 succeeded [ 10.085575] [drm] radeon atom DIG backlight
initialized [ 10.085592] radeon 0000:01:00.0: [drm] Radeon Display Connectors
[ 10.085598] radeon 0000:01:00.0: [drm] Connector 0: [ 10.085603] radeon
0000:01:00.0: [drm] LVDS-1 [ 10.085606] radeon 0000:01:00.0: [drm] DDC:
0x6560 0x6560 0x6564 0x6564 0x6568 0x6568 0x656c 0x656c [ 10.085613] radeon
0000:01:00.0: [drm] Encoders: [ 10.085617] radeon 0000:01:00.0: [drm]
LCD1: INTERNAL_UNIPHY [ 10.085620] radeon 0000:01:00.0: [drm] Connector 1: [
10.085622] radeon 0000:01:00.0: [drm] HDMI-A-1 [ 10.085624] radeon
0000:01:00.0: [drm] HPD1 [ 10.085626] radeon 0000:01:00.0: [drm] DDC:
0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c [ 10.085629] radeon
0000:01:00.0: [drm] Encoders: [ 10.085631] radeon 0000:01:00.0: [drm]
DFP1: INTERNAL_UNIPHY1 [ 10.085633] radeon 0000:01:00.0: [drm] Connector 2: [
10.085635] radeon 0000:01:00.0: [drm] VGA-1 [ 10.085637] radeon
0000:01:00.0: [drm] DDC: 0x64d8 0x64d8 0x64dc 0x64dc 0x64e0 0x64e0 0x64e4
0x64e4 [ 10.085640] radeon 0000:01:00.0: [drm] Encoders: [ 10.085642]
radeon 0000:01:00.0: [drm] CRT1: INTERNAL_KLDSCP_DAC1 [ 10.096534] [drm]
Initialized radeon 2.51.0 for 0000:01:00.0 on minor 0 [ 10.484795] [drm] fb
mappable at 0xB0363000 [ 10.484809] [drm] vram apper at 0xB0000000 [
10.484812] [drm] size 4325376 [ 10.484814] [drm] fb depth is 24 [
10.484817] [drm] pitch is 5632 [ 10.485104] fbcon: radeondrmfb (fb0) is
primary device [ 10.485119] radeon 0000:01:00.0: [drm] fb0: radeondrmfb frame
buffer device daby@daby-Satellite-S855:~$ ^C daby@daby-Satellite-S855:~$ cat
/proc/version_signature > version.log daby@daby-Satellite-S855:~$ sudo lspci
-vnvn > lspci-vnvn.log [sudo: authenticate] Contraseña:
daby@daby-Satellite-S855:~$ lsb_release -rd' > ^C daby@daby-Satellite-S855:~$
lsb_release -rd Description: Ubuntu 26.04.1 LTS Release: 26.04
daby@daby-Satellite-S855:~$ apt-cache policy pkgname N: No se ha podido
localizar el paquete pkgname daby@daby-Satellite-S855:~$ ped Orden «ped» no
encontrada, pero hay 19 similares. daby@daby-Satellite-S855:~$ pwd /home/daby
daby@daby-Satellite-S855:~$ ls -ltr total 2141852 drwxr-xr-x 2 daby daby
4096 Feb 24 2025 Público drwxr-xr-x 2 daby daby 4096 Feb 24 2025
Plantillas drwxr-xr-x 2 daby daby 4096 Feb 24 2025 Documentos
drwxr-xr-x 2 daby daby 4096 Feb 24 2025 Música drwxrwxr-x 3 daby daby
4096 Mar 6 2025 intellij-chatgpt -rw------- 1 daby daby 2193139755
Mar 6 2025 java_error_in_idea.hprof -rw-rw-r-- 1 daby daby 76 Mar
6 2025 pro.txt drwxrwxr-x 6 daby daby 4096 Mar 6 2025 'Biblioteca de
calibre' drwxr-xr-x 2 root root 4096 Mar 9 2025 myapp drwxrwxr-x 3
daby daby 4096 Mar 30 2025 alfa drwxrwxr-x 3 daby daby 4096 Apr
24 2025 NetBeansProjects drwxr-xr-x 2 daby daby 4096 Sep 11 2025
Escritorio drwxr-xr-x 4 daby daby 4096 May 4 01:11 Vídeos drwxr-xr-x
5 daby daby 4096 Aug 10 23:25 Imágenes drwxr-xr-x 23 daby daby
12288 Sep 29 13:15 Descargas drwx------ 30 daby daby 4096 Sep 29 18:40
snap -rw-rw-r-- 1 daby daby 34 Sep 30 18:19 version.log -rw-rw-r-- 1
daby daby 34875 Sep 30 18:19 lspci-vnvn.log daby@daby-Satellite-S855:~$"
https://bugs.launchpad.net/bugs/2169102/+attachment/6004139/+files/lspci-vnvn.log
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https://bugs.launchpad.net/bugs/2169102
Title:
[Regression] Window flickering and blanking on Electron/Chromium apps
under Wayland with legacy radeon driver (Radeon HD 7670M) on kernel
7.0.0-34-generic
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