I tested with another ATI GPU, the Radeon HD 4670 (AGP) one, an high-end TeraScale 1 generation card. The computer did not manage to display the desktop, the dmesg was full of errors about GPU lockup, and I did not managed to reboot properly the computer (had to uses magic SysRq keys).
I tested with an Nvidia GPU, the GeForce 8400 GS rev.2 (PCI), a low-end Tesla 1.0 generation card, running nouveau. The computer did not manage to display the desktop (but displayed garbage instead). Though, I noticed nothing relevant in dmesg and could reboot properly from another host through SSH. I entirely reinstalled the 5.4.0-48-generic kernel and modules packages, regenerated initramfs, problem is still there. I noticed that at the time the 5.4.0-48-generic kernel was installed many other packages were upgraded as well (including some related to firmwares and initramfs) so to rules them out I regenerated the 5.4.0-47-generic again, making sure this one is generated against the same files and with the same tools, and I still don't reproduce the bug on 5.4.0-47-generic kernel. So, that looks really kernel related, all the other packages are the same, and when using other kernel, that other kernel runs with exact same files or files generated with exact same tools without reproducing the bug. I also tested the system on another computer but could not reproduce the bug on that other computer. So, it looks like the bug is tied to the 5.4.0-48-generic kernel on that particular hardware. This bug makes Ubuntu 20.04 and this hardware completely unusable once the 5.4.0-48-generic kernel is installed and used. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1899304 Title: Huge performance regression, Unvanquished game goes from 70fps to 7fps, GNOME Shell never finishes to load, GNOME desktop unusable Status in linux package in Ubuntu: Confirmed Bug description: This system runs Ubuntu 20.04, freshly installed 3~4 months ago (July 2020). There is two kernels available on this system: - 5.4.0-47-generic - 5.4.0-48-generic With kernel 5.4.0-47-generic: - GNOME shell loads properly on Radeon X1950 PRO, - Unvanquished game runs on ATI Radeon X1950 PRO at 70 fps on 1280×720 resolution, - Unvanquished game runs on ATI Radeon 9500 at 40 fps on 640×480 resolution. Everything looks consistent with the limits and the age of the hardware. With kernel 5.4.0-48-generic: - GNOME Shell never finish to load on Radeon X1950 PRO, either a grey screen is displayed and keyboard shortcuts does not respond, or the top bar is stuck between the center and the top of the screen and the shell does not respond, or the top bar on the top of the screen but the shell does not respond, to get a desktop I run `sudo systemctl stop display-manager` then `startx /usr/bin/lxsession` from a TTY. Running GNOME Shell with startx or from a lone xterm started with startx leads to same issues. - Unvanquished game runs on ATI Radeon X1950 PRO at 7 fps on 1280×720 resolution, - Unvanquished game runs on ATI Radeon 9500 at 3 fps on 640×480 resolution. Note: for unknown reasons, GNOME Shell loads properly on the ATI Radeon 9500 but not on the Radeon X1950 PRO. Everything is slow. When the game is running, a very high load is reported by htop, which does not look like the experience seen on the 5.4.0-47-generic kernel. When the game is running cycling between windows using Alt-Tab takes a lot of second while it's immediate on 5.4.0-47-generic kernel. Also, even without the game running or on a lightweight desktop like LXDE, cycling windows is not smooth and window refreshing is slow enough to be noticeable. About the hardware, note that: - the CPU only has one core, no hyperthreading (AMD Athlon 64 FX for socket 939), - the GPUs are AGP ones using R300 and R500 technology (pre-TeraScale), - there is 3GB of DDR RAM, - there is no on-disk swap but zram-based swap in compressed ram is used, - system is stored on and boots from an USB 3.1 key plugged on an USB 2.0 port, - /tmp is a tmpfs ram disk, - CPU is set to performance profile, - the install is not really messy and not many packages are installed, this USB key is purposed for hardware/system testing and to diagnose such issues. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-48-generic 5.4.0-48.52 ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60 Uname: Linux 5.4.0-48-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.9 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: illwieckz 7503 F.... pulseaudio CasperMD5CheckResult: skip Date: Sun Oct 11 01:47:48 2020 InstallationDate: Installed on 2020-07-09 (93 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) IwConfig: enp0s11 no wireless extensions. lo no wireless extensions. MachineType: MSI MS-6702E ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=fr_FR.UTF-8 SHELL=/bin/bash ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-48-generic root=UUID=10314d0c-ec6b-4f7f-b926-ed8b80185331 ro PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-5.4.0-48-generic N/A linux-backports-modules-5.4.0-48-generic N/A linux-firmware 1.187.3 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/12/2006 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 080011 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: MS-6702E dmi.board.vendor: MSI dmi.board.version: 1.0 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080011:bd10/12/2006:svnMSI:pnMS-6702E:pvr1.0:rvnMSI:rnMS-6702E:rvr1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.family: To Be Filled By O.E.M. dmi.product.name: MS-6702E dmi.product.sku: To Be Filled By O.E.M. dmi.product.version: 1.0 dmi.sys.vendor: MSI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1899304/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
