Kernel.org: 5.2.9
sid (unstable): 5.2.9-2
buster (testing): 4.19.37-5+deb10u2
stretch (stable): 4.9.168-1+deb9u5
jessie (oldstable): 3.16.72-1

Debian GNU/Linux device driver check & report

ECS: P4M800Pro-M

PCI IDWorks?VendorDeviceDriverKernel
11060314YesVIA Technologies, Inc.CN700/VN800/P4M800CE/Pro Host Bridgevia-agp
11061314VIA Technologies, Inc.CN700/VN800/P4M800CE/Pro Host Bridge
11062314VIA Technologies, Inc.CN700/VN800/P4M800CE/Pro Host Bridge
11063208YesVIA Technologies, Inc.PT890 Host Bridgevia-agp
11064314VIA Technologies, Inc.CN700/VN800/P4M800CE/Pro Host Bridge
11067314VIA Technologies, Inc.CN700/VN800/P4M800CE/Pro Host Bridge
1106b198YesVIA Technologies, Inc.VT8237/VX700 PCI Bridgevia-agp
10ec8139YesRealtek Semiconductor Co., Ltd.RTL-8139/8139C/8139C+8139cp,8139toov2.6.25-
11063149YesVIA Technologies, Inc.VIA VT6420 SATA RAID Controllersata_viav2.6.25-
11060571YesVIA Technologies, Inc.VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDEpata_viav2.6.25-
11063038YesVIA Technologies, Inc.VT82xxxxx UHCI USB 1.1 Controllerusb-uhci,uhci-hcd
11063038YesVIA Technologies, Inc.VT82xxxxx UHCI USB 1.1 Controllerusb-uhci,uhci-hcd
11063038YesVIA Technologies, Inc.VT82xxxxx UHCI USB 1.1 Controllerusb-uhci,uhci-hcd
11063038YesVIA Technologies, Inc.VT82xxxxx UHCI USB 1.1 Controllerusb-uhci,uhci-hcd
11063104YesVIA Technologies, Inc.USB 2.0ehci-hcd
11063227YesVIA Technologies, Inc.VT8237 ISA bridge [KT600/K8T800/K8T890 South]i2c-viaprov2.6.25-
11063059YesVIA Technologies, Inc.VT8233/A/8235/8237 AC97 Audio Controllersnd-via82xxv2.6.25-
11063344YesVIA Technologies, Inc.CN700/P4M800 Pro/P4M800 CE/VN800 [S3 UniChrome Pro]viafbv2.6.38-

PC is using SATA drives - OK.  USB - OK. Serial Parallel ports - OK.  IDE - OK 1 GB DDR2 RAM.  On board video - See below.  On board audio - OK.  On board LAN - disabled, did not work consistently.  Installed an RTL 8139D PCI NIC.
The UniChrome Pro chipset does not work completely.  The default driver chosen is vesa generic. No 3D or other enhanced video features.  VIA has posted driver patch source code and instructions on their www.viaarena.com website.  Have not tried to install as yet.