I reproduce the bug with 5.4.0-51-generic and 5.4.0-52-generic.
The 5.4.0-47-generic one is the last known kernel to work on that system.
** Summary changed:
- 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
I reproduce the bug with the 5.4.0-49-generic kernel from `proposed`
when running the Radeon X1950 PRO.
Note: I previously joined a dmesg log file about GPU lockup, such lockup
is not always logged but the GNOME Shell session is stuck anytime it is
started.
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** Attachment added: "Screen photo of display garbage on Linux 5.4.0-48 with
Nvidia GeForce 8400 GS rev.2 (PCI)"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1899304/+attachment/5421058/+files/20201011-231213-000.display-garbage-on-nvidia-geforce-8400gs2-pci.jpg
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You received this
** Attachment added: "Screen photo of GNOME Shell hanging on Linux 5.4.0-48
with ATI Radeon X1950 PRO (AGP)."
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1899304/+attachment/5421057/+files/20201011-014117-000.gnome-shell-hang-on-ati-radeon-x1950pro-agp.jpg
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I forgot to say that when I manage to get a non-composited LXDE desktop
running on Radeon X1950 PRO, started by hand using `startx`, and I run
the Unvanquished game, more than 51% of the CPU time is spent on OpenAL
thread, i.e. the audio thread, which is wrong. This thread is usually
really
** Summary changed:
- 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
