I've discovered some useful info about this bug. First, there's a forum thread about it with lots of good info: https://ubuntu- mate.community/t/20-04-display-issues-with-amd-gpu/21648/37
Second, a new workaround. To recap, the first workaround I found was booting with nomodeset, but that disables all hardware acceleration. The new workaround, as detailed in the forum thread, is to open MATE Tweak, and in the Windows tab, change the window manager to Marco (no compositor). Third, we found the upstream bug in xf86-video-amdgpu: https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/issues/10 . I believe this is packaged as xserver-xorg-video-amdgpu in Ubuntu. It's been fixed upstream and the Ubuntu Mate devs will include it in 20.04.1 is possible. Fourth, bug #1873895 appears to be the same bug, but originally reported as manifesting in Xubuntu. Maybe this is a duplicate. ** Bug watch added: gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/issues #10 https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/issues/10 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1882525 Title: [amdgpu] MATE desktop is corrupted upon login on Ryzen APU Status in marco package in Ubuntu: New Status in mesa package in Ubuntu: New Status in xorg-server package in Ubuntu: New Status in xserver-xorg-video-amdgpu package in Ubuntu: New Bug description: Today I upgraded from Ubuntu MATE 19.10 to 20.04. After doing so, Ubuntu boots normally to the display manager (login screen) as expected. But once I log in, everything on the screen is cut up into horizontal slices, with each slice offset farther right than the slice above, and squares of random colors running diagonally across the screen. I've attached a picture of my monitor showing the issue for reference. My hardware is a home-built PC with an ASUS Prime B450M motherboard, a Ryzen 3 2200G APU, and using that APU's integrated graphics. In terms of software I'm running Ubuntu 20.04, which I just upgraded to and did a software update on. I have Linux 5.4.0-33-generic, X.Org 1.20.8, and Mesa 20.0.4. Before I upgraded Ubuntu, I was affected by Bug #1880041 but it seems fixed in the new kernel. I don't believe they're related but I figure it's worth mentioning. I tried adding the nomodeset kernel option at boot, and it's an effective workaround. Also, I tried booting from an Ubuntu Mate 20.04 live USB to see if this was caused by some quirk of my particular software setup, and successfully reproduced the bug, proving it wasn't. If you'd like me to, I can provide log files, system information, etc. or help narrow it down by testing workarounds. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xserver-xorg-core 2:1.20.8-2ubuntu2.1 ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34 Uname: Linux 5.4.0-33-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.2 Architecture: amd64 CasperMD5CheckResult: skip CompositorRunning: None Date: Mon Jun 8 06:41:47 2020 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu ExecutablePath: /usr/lib/xorg/Xorg ExtraDebuggingInterest: Yes GraphicsCard: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] [1002:15dd] (rev c8) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] [1043:876b] InstallationDate: Installed on 2019-10-20 (231 days ago) InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Release amd64 (20191017) MachineType: System manufacturer System Product Name ProcEnviron: PATH=(custom, no user) ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-33-generic root=UUID=43189257-cc94-4e98-ac1d-e16336dd152e ro quiet splash vt.handoff=7 SourcePackage: xorg-server UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/13/2019 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2006 dmi.board.asset.tag: Default string dmi.board.name: PRIME B450M-A 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.:bvr2006:bd11/13/2019:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEB450M-A:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring: 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: System manufacturer 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 20.0.4-2ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.1 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/marco/+bug/1882525/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
