Comment 2 for bug 1944991

The BIOS of that computer have some ACPI bugs: (I believe latest BIOS but unsure... I did upgrade to 3.14) but still showing as 3.14.
DMI: Hewlett-Packard HP Compaq dc5850 Small Form Factor/3029h, BIOS 786F6 v03.14 11/15/2011

[ 0.283156] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI HPX-Type3]
[ 0.283163] ACPI BIOS Error (bug): \_SB.PCI0._OSC: Excess arguments - ASL declared 5, ACPI requires 4 (20210331/nsarguments-162)
[ 0.283317] ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0._OSC.CAPD], AE_ALREADY_EXISTS (20210331/dsfield-184)
[ 0.283373] ACPI Error: AE_ALREADY_EXISTS, CreateBufferField failure (20210331/dswload2-477)

[ 0.283422]
               Initialized Local Variables for Method [_OSC]:
[ 0.283424] Local0: (____ptrval____) <Obj> Integer 0000000000000001
[ 0.283432] Local1: (____ptrval____) <Obj> Integer 0000000000000005

[ 0.283439] Initialized Arguments for Method [_OSC]: (5 arguments defined for method invocation)
[ 0.283440] Arg0: (____ptrval____) <Obj> Buffer(16) 5B 4D DB 33 F7 1F 1C 40
[ 0.283452] Arg1: (____ptrval____) <Obj> Integer 0000000000000001
[ 0.283457] Arg2: (____ptrval____) <Obj> Integer 0000000000000003
[ 0.283462] Arg3: (____ptrval____) <Obj> Buffer(12) 01 00 00 00 1F 01 00 00

[ 0.283479] ACPI Error: Aborting method \_SB.PCI0._OSC due to previous error (AE_ALREADY_EXISTS) (20210331/psparse-529)
[ 0.283536] acpi PNP0A08:00: _OSC: platform retains control of PCIe features (AE_ALREADY_EXISTS)
[ 0.283549] acpi PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-3f] only partially covers this bridge