AV bridge interface allows access to working DVB-T2 and analogue capture ICs, However the cx24116 DVB-S2 one requires register initialization via deblobbed firmware in order to be tuned.

lspci -vmmnn

Slot:	05:02.0
Class:	Multimedia video controller [0400]
Vendor:	Conexant Systems, Inc. [14f1]
Device:	CX23880/1/2/3 PCI Video and Audio Decoder [8800]
SVendor:	Hauppauge computer works Inc. [0070]
SDevice:	WinTV HVR-4000-HD [6902]
Rev:	05

lspci -nnk

05:02.0 Multimedia video controller [0400]: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [14f1:8800] (rev 05)
	Subsystem: Hauppauge computer works Inc. WinTV HVR-4000-HD [0070:6902]
	Kernel driver in use: cx8800
	Kernel modules: cx8800

lspci -nnpk

00:06.0 Multimedia video controller [0400]: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [14f1:8800] (rev 05)

lspci -v

00:06.0 Multimedia video controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
	Subsystem: LeadTek Research Inc. Device 665e
	Flags: bus master, medium devsel, latency 32, IRQ 17
	Memory at e6000000 (32-bit, non-prefetchable) [size=16M]
	Capabilities: <access denied>
	Kernel driver in use: cx8800
	Kernel modules: cx8800

lspci -vvnnk

03:02.0 Multimedia video controller [0400]: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [14f1:8800] (rev 05)
        Subsystem: Avermedia Technologies Inc AverTV Studio 303 (M126) [1461:000b]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 32 (5000ns min, 13750ns max), Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 23
        Region 0: Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
        Capabilities: [44] Vital Product Data
pcilib: sysfs_read_vpd: read failed: Input/output error
                Not readable
        Capabilities: [4c] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: cx8800
        Kernel modules: cx8800