My system has 5.8.13 kernel and it detects the TBS 6981 card,
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$ dmesg | grep cx238
[ 25.604771] cx23885: cx23885 driver version 0.0.4 loaded
[ 25.604807] cx23885 0000:03:00.0: enabling device (0000 -> 0002)
[ 25.604918] cx23885: CORE cx23885[0]: subsystem: 6981:8888, board: TurboSight TBS 6981 [card=40,autodetected]
[ 27.828181] cx25840 8-0044: cx23885 A/V decoder found @ 0x88 (cx23885[0])
[ 28.453582] cx25840 8-0044: loaded v4l-cx23885-avcore-01.fw firmware (16382 bytes)
[ 28.466931] cx23885: cx23885_dvb_register() allocating 1 frontend(s)
[ 28.466932] cx23885: cx23885[0]: cx23885 based dvb card
[ 28.471211] dvbdev: DVB: registering new adapter (cx23885[0])
[ 28.471213] cx23885 0000:03:00.0: DVB: registering adapter 0 frontend 0 (Conexant CX24117/CX24132)...
[ 28.471470] cx23885: cx23885_dvb_register() allocating 1 frontend(s)
[ 28.471470] cx23885: cx23885[0]: cx23885 based dvb card
[ 28.471474] dvbdev: DVB: registering new adapter (cx23885[0])
[ 28.471475] cx23885 0000:03:00.0: DVB: registering adapter 1 frontend 0 (Conexant CX24117/CX24132)...
[ 28.471619] cx23885: cx23885_dev_checkrevision() Hardware revision = 0xa5
[ 28.471622] cx23885: cx23885[0]/0: found at 0000:03:00.0, rev: 4, irq: 16, latency: 0, mmio: 0xdc200000
Unfortunately, if i try to do a blind scan with w_scan2 i get messages that "freq 6.21 unsupported by driver: min=0.95, max=2.15". Is this frequency a limitation of the opensource driver?