Kernel.org: 5.3.7
sid (unstable): 5.2.17-1
buster (testing): 4.19.67-2+deb10u1
stretch (stable): 4.9.189-3+deb9u1
jessie (oldstable): 3.16.74-1

Debian GNU/Linux device driver check & report

HP: TC2120

PCI IDWorks?VendorDeviceDriverKernel
11660017BroadcomGCNB-LE Host Bridge
11660017BroadcomGCNB-LE Host Bridge
14e416a6YesBroadcom CorporationNetXtreme BCM5702X Gigabit Ethernettg3v2.6.25-
90050080YesAdaptecAIC-7892A U160/maic7xxxv2.6.25-
80861229YesIntel Corporation82557/8/9/0/1 Ethernet Pro 100e100v2.6.25-
10024752YesATI Technologies IncRage XLatyfbv2.6.27-
11660203YesBroadcomCSB6 South Bridgei2c-piix4v2.6.25-
11660213YesBroadcomCSB6 RAID/IDE Controllerpata_serverworksv2.6.25-
11660221YesBroadcomCSB6 OHCI USB Controllerusb-ohci,ohci-hcd
11660227BroadcomGCLE-2 Host Bridge

everything works just fine. maybe some little problem with lmsensors&2.4 kernel.
serverworks chipset, NO AGP, works fine. if you want i can supply config for 2.4 and also 2.6 kernel. 

machine can be found at http://h18004.www1.hp.com/products/servers/tc2120/