** Also affects: xfwm4 (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to libxcb in Ubuntu.
https://bugs.launchpad.net/bugs/1873895
Title:
Regression: block staircase display with side-by-side monitors
Status in libxcb package in Ubuntu:
New
Status in xfwm4 package in Ubuntu:
New
Status in xserver-xorg-video-amdgpu package in Ubuntu:
New
Bug description:
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
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libxcb/+bug/1873895/+subscriptions
--
Mailing list: https://launchpad.net/~touch-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~touch-packages
More help : https://help.launchpad.net/ListHelp
