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https://bugs.launchpad.net/bugs/1902795
Title:
PCI graphics seems to be broken since years on AMD K8/K10 platform
(work on Intel)
Status in linux package in Ubuntu:
Incomplete
Bug description:
This is an issue I found while investigating #1899304
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1899304
The big concern is that if AGP is disabled, there is no fallback
display option on those platforms.
After having discovered some K8 and K10 computers running AGP cards
stopped working with 5.4.0-48 (Ubuntu 20.04 LTS), I had the idea to
try some PCI cards to know if problems came from AGP or something
else, and I've discovered another issue instead.
Note that I'm not talking about PCI express, but good old PCI.
The other issue I found is that PCI graphics on AMD K8/K10 platform is
broken since years. This got probably unnoticed because such hardware
works on Intel platform and those cards are not very common, so the
chance to fulfill all the requirements to reproduce the bug are not
that high.
To make the test significant enough I used two PCI devices from two
makers, and some that are not so old: they both support OpenGL 3.3,
have 512MB of VRAM, and one of them even have HDMI.
- PCI ATI Radeon HD 4350 (RV710, Terascale 1), HDMI + DVI-I + VGA
- PCI Nvidia Geforce 8400 GS rev.2 (NV98, Tesla 1.0), DVI-I + VGA
I've driven tests on four computers:
- K10 PCIe based: Dell Optiplex 740 motherboard with AMD Athlon 64 X2 CPU
(dual core), Nvidia C51 bridge, 6GB DDR2 667MHz, PCIe + PCI
- K8 AGP based: ASRock AM2NF3-VSTA motherboard with AMD Phenom II X4 970 CPU
(quad core), Nvidia nForce3 bridge, 16GB DDR2 800MHz, AGP + PCI
- K8 AGP based: MSI MS-6702E motherboard with AMD Athlon 64 3200+ CPU (single
core), VIA K8T800Pro, VT8237/8251 bridge, 3GB DDR 400MHz, AGP + PCI
- Intel PCIe based: Lenovo ThinkCentre M58 motherboard with Pentium E5200 CPU
(dual core), Intel 82801 PCI Bridge, 1GB DDR2 800MHz, PCIe + PCI
Both PCI GPU work on the Intel based computer, and I get performances that
looks correct for those GPU given they are PCI ones. You can find real-life use
case test result here (look for “PCI”):
https://wiki.unvanquished.net/wiki/GPU_compatibility_matrix
I tested two Ubuntu versions and multiple kernels:
Ubuntu 20.04 Focal LTS Linux 5.4.0-48-generic
Ubuntu 20.04 Focal LTS Linux 5.4.0-47-generic
Ubuntu 16.04 Xenial LTS Linux 4.15.0-118-generic
Ubuntu 16.04 Xenial LTS Linux 4.8.0-36-generic
Ubuntu 16.04 Xenial LTS Linux 4.4.0-190-generic
All those configurations fail with those two PCI GPUs on AMD K8/K10
platforms.
I got some logs and screenshots, so I will add them.
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