apport information
** Also affects: xserver-xorg-video-amdgpu (Ubuntu)
Importance: Undecided
Status: New
** Tags added: apport-collected focal ubuntu
** Description changed:
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
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1873895/+attachment/5357345/+files/CurrentDmesg.txt
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https://bugs.launchpad.net/bugs/1873895
Title:
Regression: block staircase display with side-by-side monitors
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