AGP disablement leaves GPUs without working alternative (PCI fallback is broken), makes very-capable ATI TeraScale GPUs unusable
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
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-
ProcVersionSign
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CasperMD5CheckR
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-
PATH=(custom, no user)
LANG=fr_FR.UTF-8
SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageV
linux-
linux-
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.
dmi.board.name: MS-6702E
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
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.
dmi.sys.vendor: MSI
description: | updated |
description: | updated |
summary: |
- Huge performance regression, Unvanquished game goes from 70fps to 7fps, - GNOME Shell never finishes to load, GNOME desktop unusable + Linux 5.4.0-48 causes GPU lockup, huge performance drop, makes GNOME + desktop fail to start and games going from 70fps to 7fps, slow file + loading, audio issues |
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
summary: |
- Linux 5.4.0-48 (and later) causes GPU lockup, huge performance drop, + Linux 5.4.0-48 (and later) causes AGP GPU lockup, huge performance drop, makes GNOME desktop fail to start and games going from 70fps to 7fps, slow file loading, audio issues |
summary: |
- Linux 5.4.0-48 (and later) causes AGP GPU lockup, huge performance drop, - makes GNOME desktop fail to start and games going from 70fps to 7fps, - slow file loading, audio issues + AGP disablement leaves GPUs without working alternative (PCI fallback is + broken), makes very-capable ATI TeraScale AGP GPUs unusable |
summary: |
AGP disablement leaves GPUs without working alternative (PCI fallback is - broken), makes very-capable ATI TeraScale AGP GPUs unusable + broken), makes very-capable ATI TeraScale GPUs unusable |
tags: | added: kernel-bug |
tags: | added: patch |
This change was made by a bot.