A more careful reading of dmesg is showing something wrong:
[ 9.354432] media: module verification failed: signature and/or required key missing - tainting kernel[ 9.354703] media: Linux media interface: v0.10
...
[ 10.119435]
WARNING: You are using an experimental version of the media stack.
As the driver is backported to an older kernel, it doesn't offer
enough quality for its usage in production.
Use it with care.
Latest git patches (needed if you report a bug to linux-media@vger.kernel.org):
026a8a36fed7af47bc7acbbebf0f3174024f6ccf stv0910: Fix gate_ctrl exit path on i2c errors[ 10.133676] usbcore: registered new interface driver btusb
...
[ 11.494841] TBSECP3 driver 0000:04:00.0: enabling device (0000 -> 0002)
[ 11.494888] TBSECP3 driver 0000:04:00.0: TurboSight TBS 6522 (Dual MultiStandard)
[ 11.495183] DVB: registering new adapter (TBSECP3 DVB Adapter)
...
[ 11.613029] TBSECP3 driver 0000:04:00.0: MAC address 00:22:ab:f0:d3:f6
[ 11.641639] i2c i2c-8: Added multiplexed i2c bus 12
[ 11.641642] si2183 8-0067: Silicon Labs Si2183 successfully attached
[ 11.820536] si2157 12-0060: Silicon Labs Si2147/2148/2157/2158 successfully attached
[ 11.894943] i2c i2c-12: av201x: Airoha Technology AV201x successfully attached
[ 11.894946] TBSECP3 driver 0000:04:00.0: DVB: registering adapter 0 frontend 0 (Silicon Labs Si2183)...
[ 11.894984] TBSECP3 driver 0000:04:00.0: DVB: registering adapter 0 frontend 1 (Silicon Labs Si2183)...
[ 11.895008] DVB: registering new adapter (TBSECP3 DVB Adapter)
[ 12.012990] TBSECP3 driver 0000:04:00.0: MAC address 00:22:ab:f0:d3:f7
[ 12.013586] si2183 8-0064: Silicon Labs Si2183 successfully attached
[ 12.018801] si2157 12-0061: Silicon Labs Si2147/2148/2157/2158 successfully attached
[ 12.018806] i2c i2c-12: av201x: Airoha Technology AV201x successfully attached
[ 12.018808] TBSECP3 driver 0000:04:00.0: DVB: registering adapter 1 frontend 0 (Silicon Labs Si2183)...
[ 12.018839] TBSECP3 driver 0000:04:00.0: DVB: registering adapter 1 frontend 1 (Silicon Labs Si2183)...
[ 12.018856] TBSECP3 driver 0000:04:00.0: TurboSight TBS 6522 (Dual MultiStandard): PCI 0000:04:00.0, IRQ 32, MMIO 0xf7c00000
...
[ 77.693762] si2183 8-0067: found a 'Silicon Labs Si2183-B60'
[ 77.716946] si2183 8-0067: downloading firmware from file 'dvb-demod-si2183-b60-01.fw'
[ 78.131828] si2183 8-0067: firmware version: 6.0.2
[ 78.159424] si2157 12-0060: found a 'Silicon Labs Si2157-A30'
[ 922.001148] dvb_net: created network interface dvb1_0
[ 922.001167] dvb1_0: no feed to stop
[ 922.001169] dvb_net: removed network interface dvb1_0
[ 922.027978] dvb_net: created network interface dvb0_0
[ 922.029879] dvb0_0: no feed to stop
[ 922.029881] dvb_net: removed network interface dvb0_0
[ 922.051927] dvb_net: created network interface dvb0_0
[ 922.051942] dvb0_0: no feed to stop
[ 922.051943] dvb_net: removed network interface dvb0_0
Can anyone help me fixing this ?