Some follow-up with users from the Ubuntu MATE Community forums show
that this is occurring on Focal and Groovy; with 5.4, 5.8, and 5.10
kernels.
Following is a list of hardware and graphics information from affected users:
System:
Host: huppyryzen Kernel: 5.4.0-54-generic x86_64 bits: 64
Desktop: MATE 1.24.0 Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine:
Type: Desktop Mobo: ASUSTeK model: PRIME B350-PLUS v: Rev X.0x
serial: <superuser/root required> UEFI: American Megatrends v: 5602
date: 07/14/2020
Graphics:
Device-1: AMD Vega 10 XL/XT [Radeon RX Vega 56/64] driver: amdgpu
v: kernel
Display: x11 server: X.Org 1.20.8 driver: amdgpu,ati
unloaded: fbdev,modesetting,vesa resolution: 3440x1440~60Hz
OpenGL:
renderer: Radeon RX Vega (VEGA10 DRM 3.35.0 5.4.0-54-generic LLVM 11.0.0)
v: 4.6 Mesa 20.3.0-rc2
System:
Host: marptop Kernel: 5.4.0-54-generic x86_64 bits: 64
Desktop: MATE 1.24.0 Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine:
Type: Laptop System: HP product: HP Laptop 17-ca0xxx v: N/A
serial: <superuser/root required>
Mobo: HP model: 84D2 v: 91.17 serial: <superuser/root required> UEFI: AMI
v: F.21 date: 11/15/2018
Graphics:
Device-1: AMD Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series]
driver: amdgpu v: kernel
Display: x11 server: X.Org 1.20.8 driver: amdgpu,ati
unloaded: fbdev,modesetting,vesa resolution: 1600x900~60Hz
OpenGL: renderer: AMD RAVEN (DRM 3.35.0 5.4.0-54-generic LLVM 10.0.0)
v: 4.6 Mesa 20.0.8
System:
Host: duck-laptop2 Kernel: 5.8.0-29-generic x86_64 bits: 64 Desktop: MATE
1.24.1
Distro: Ubuntu 20.10 (Groovy Gorilla)
Machine:
Type: Laptop System: HP product: HP Laptop 15-db0xxx v:
Type1ProductConfigId serial: <superuser/root required>
Mobo: HP model: 84AE v: 86.20 serial: <superuser/root required> UEFI:
Insyde v: F.10 date: 05/31/2018
Graphics:
Device-1: AMD Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series]
driver: amdgpu v: kernel
Device-2: Lite-On 1351 type: USB driver: uvcvideo
Display: x11 server: X.Org 1.20.9 driver: amdgpu,ati unloaded:
fbdev,modesetting,vesa resolution: 1920x1080~60Hz
OpenGL: renderer: AMD RAVEN (DRM 3.38.0 5.8.0-29-generic LLVM 11.0.0) v:
4.6 Mesa 20.2.1
System:
Host: jgjmate-ThinkPad-E595 Kernel: 5.8.0-32-generic x86_64 bits: 64
Desktop: MATE 1.24.1 Distro: Ubuntu 20.10 (Groovy Gorilla)
Machine:
Type: Laptop System: LENOVO product: 20NF0012US v: ThinkPad E595
serial: <superuser/root required>
Mobo: LENOVO model: 20NF0012US serial: <superuser/root required>
UEFI: LENOVO v: R11ET39W (1.19 ) date: 09/11/2020
Graphics:
Device-1: AMD Picasso driver: amdgpu v: kernel
Device-2: Acer SunplusIT Integrated Camera type: USB driver: uvcvideo
Display: x11 server: X.Org 1.20.9 driver: amdgpu,ati
unloaded: fbdev,modesetting,vesa resolution: 1920x1080~60Hz
OpenGL: renderer: AMD RAVEN (DRM 3.38.0 5.8.0-32-generic LLVM 11.0.0)
v: 4.6 Mesa 20.2.1
System:
Host: XXXXXXXX Kernel: 5.4.0-58-generic x86_64 bits: 64
Desktop: MATE 1.24.0 Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine:
Type: Laptop System: HP product: HP Laptop 15-db0xxx
v: Type1ProductConfigId serial: <superuser/root required>
Mobo: HP model: 84AC v: 85.26 serial: <superuser/root required>
UEFI: Insyde v: F.22 date: 11/06/2019
Graphics:
Device-1: AMD Stoney [Radeon R2/R3/R4/R5 Graphics] driver: amdgpu
v: kernel
Display: x11 server: X.Org 1.20.8 driver: amdgpu,ati
unloaded: fbdev,modesetting,vesa resolution: 1366x768~60Hz
OpenGL: renderer: AMD STONEY (DRM 3.35.0 5.4.0-58-generic LLVM 10.0.0)
v: 4.5 Mesa 20.0.8
System:
Host: pc Kernel: 5.4.0-58-generic x86_64 bits: 64 Desktop: MATE 1.24.0
Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine:
Type: Desktop Mobo: MSI model: B75MA-P45 (MS-7798) v: 1.0 serial:
<superuser/root required>
BIOS: American Megatrends v: 1.9 date: 09/30/2013
Graphics:
Device-1: Advanced Micro Devices [AMD/ATI] Navi 10 [Radeon RX 5600 OEM/5600
XT / 5700/5700 XT] driver: amdgpu
v: kernel
Display: x11 server: X.Org 1.20.8 driver: amdgpu,ati unloaded:
fbdev,modesetting,radeon,vesa
resolution: 1366x768~60Hz
OpenGL: renderer: AMD Radeon RX 5600 XT (NAVI10 DRM 3.38.0 5.4.0-58-generic
LLVM 11.0.0)
v: 4.6 Mesa 21.0.0-devel (git-6a34a68 2020-12-13 focal-oibaf-ppa)
System:
Host: ACER-xk2308 Kernel: 5.10.4-051004-generic x86_64 bits: 64 Desktop:
MATE 1.24.0
Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine:
Type: Desktop Mobo: MSI model: B75MA-P45 (MS-7798) v: 1.0 serial:
<superuser/root required>
BIOS: American Megatrends v: 1.9 date: 09/30/2013
Graphics:
Device-1: Advanced Micro Devices [AMD/ATI] Navi 10 [Radeon RX 5600 OEM/5600
XT / 5700/5700 XT] driver: amdgpu
v: kernel
Display: x11 server: X.Org 1.20.8 driver: amdgpu,ati unloaded:
fbdev,modesetting,radeon,vesa
resolution: 1366x768~60Hz
OpenGL: renderer: AMD Radeon RX 5600 XT (NAVI10 DRM 3.40.0
5.10.4-051004-generic LLVM 11.0.0)
v: 4.6 Mesa 21.0.0-devel (git-24dcdc3 2021-01-04 focal-oibaf-ppa)
System:
Host: ACER-xk2308 Kernel: 5.8.0-38-generic x86_64 bits: 64 Desktop: MATE
1.24.0
Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine:
Type: Desktop System: MSI product: MS-7798 v: 1.0 serial: <superuser/root
required>
Mobo: MSI model: B75MA-P45 (MS-7798) v: 1.0 serial: <superuser/root
required> BIOS: American Megatrends v: 1.9
date: 09/30/2013
Graphics:
Device-1: Advanced Micro Devices [AMD/ATI] Navi 10 [Radeon RX 5600 OEM/5600
XT / 5700/5700 XT] driver: amdgpu
v: kernel
Display: x11 server: X.Org 1.20.9 driver: amdgpu,ati unloaded:
fbdev,modesetting,radeon,vesa
resolution: 1366x768~60Hz
OpenGL: renderer: AMD Radeon RX 5600 XT (NAVI10 DRM 3.38.0 5.8.0-38-generic
LLVM 11.0.1)
v: 4.6 Mesa 21.1.0-devel (git-7b48d5d 2021-01-16 focal-oibaf-ppa)
System:
Host: lorenzo-A315-41 Kernel: 5.4.0-65-generic x86_64 bits: 64
Desktop: MATE 1.24.0 Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine:
Type: Laptop System: Acer product: Aspire A315-41 v: V1.18
serial: <superuser/root required>
Mobo: RR model: Metapod_RR v: V1.18 serial: <superuser/root required>
UEFI: Insyde v: 1.18 date: 06/18/2020
Graphics:
Device-1: AMD Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series]
driver: amdgpu v: kernel
Display: x11 server: X.Org 1.20.9 driver: amdgpu,ati
unloaded: fbdev,modesetting,vesa resolution: 1366x768~60Hz
OpenGL: renderer: AMD RAVEN (DRM 3.35.0 5.4.0-65-generic LLVM 11.0.0)
v: 4.6 Mesa 20.2.6
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to libxcb in Ubuntu.
https://bugs.launchpad.net/bugs/1873895
Title:
Regression: block staircase display with side-by-side monitors of
different pixel widths
Status in Linux:
Unknown
Status in libxcb package in Ubuntu:
Confirmed
Status in xfwm4 package in Ubuntu:
Confirmed
Status in xserver-xorg-video-amdgpu package in Ubuntu:
Confirmed
Bug description:
Update based on further research.
This only happens when the secondary external display is operating at
a different pixel width to the internal. In this case eDP is 1920x1080
whereas the external HDMI-A-0 is natively 1680x1050.
It is caused by xfwm4's recent switch from using glx to xpresent for
AMD GPUs.
The underlying bug is in the AMD driver.
I was able to reproduce on an external 1920x1200 display only when it
was set to a non-native 1680x1050 resolution.
---
Two identical Lenovo E495 laptops with 20.04 installed. The problem occurred
initially on the laptop that is having package upgrades applied regularly.
With dual monitors and the external monitor placed left or right the
display has a blocked staircase effect shown in the attached
photograph, and seems related to
https://gitlab.freedesktop.org/xorg/driver/xf86-video-
amdgpu/-/issues/10
More detailed investigation suggests it only happens when the X
coordinate of the two monitors is different. The symptom looks like an
off-by-one error because it appears as if the display is divided into,
say, 10 rows and 15 columns but the first row has 16 'columns' worth
of blocks on it and so wraps to the beginning of the 2nd row, and so
on.
On the laptop without package upgrades being applied this didn't
happen. So I upgraded it (314 packages) and restarted and it too sees
the same problem.
I suspected libxcomposite1 and downgraded it to 1:0.4.5-0ubuntu1 but
that didn't solve it.
I now suspect libxcb but so far haven't been able to prove it.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: XFCE
DistUpgraded: Fresh install
DistroCodename: focal
DistroRelease: Ubuntu 20.04
DistroVariant: ubuntu
GraphicsCard:
Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev c1) (prog-if
00 [VGA controller])
Subsystem: Lenovo ThinkPad E595 [17aa:5124]
InstallationDate: Installed on 2020-04-08 (11 days ago)
InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200408)
MachineType: LENOVO 20NECTO1WW
Package: xserver-xorg-video-amdgpu 19.1.0-1
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-21-generic
root=/dev/mapper/ELLOE000-rootfs ro acpi_osi=! "acpi_osi=Windows 2016" quiet
splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Tags: focal ubuntu ubuntu
Uname: Linux 5.4.0-21-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirt lp lpadmin lxd plugdev sambashare sudo users
_MarkForUpload: True
dmi.bios.date: 12/23/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: R11ET32W (1.12 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20NECTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrR11ET32W(1.12):bd12/23/2019:svnLENOVO:pn20NECTO1WW:pvrThinkPadE495:rvnLENOVO:rn20NECTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad E495
dmi.product.name: 20NECTO1WW
dmi.product.sku: LENOVO_MT_20NE_BU_Think_FM_ThinkPad E495
dmi.product.version: ThinkPad E495
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
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