Hi,

After reinstalling Linux (Xubuntu 20.04.1) on my old computer the sound stopped working on my Kworld KW-TV878RF tuner card. I load the bttv module with options "card=78 radio=1" and snd-bt87x with "load_all". The corresponding dmesg is below:

[ 15.626992] bttv: driver version 0.9.19 loaded [ 15.626994] bttv: using 8 buffers with 2080k (520 pages) each for capture [ 15.627024] bttv: Bt8xx card found (0) [ 15.627166] bttv: 0: Bt878 (rev 17) at 0000:04:01.0, irq: 18, latency: 32, mmio: 0xf0001000 [ 15.627177] bttv: 0: using: Jetway TV/Capture JW-TV878-FBK, Kworld KW-TV878RF [card=78,insmod option] [ 15.627359] bttv: 0: tuner type=5 [ 15.908280] bttv: 0: audio absent, no audio device found! [ 16.454464] bttv: 0: Setting PLL: 28636363 => 35468950 (needs up to 100ms) [ 16.496037] bttv: PLL set ok [ 16.497200] bttv: 0: registered device video0 [ 16.497273] bttv: 0: registered device vbi0 [ 16.497357] bttv: 0: registered device radio ... [ 682.784918] snd_bt87x 0000:04:01.1: unknown card 0x878-0x00:0x00 [ 682.784919] snd_bt87x 0000:04:01.1: please mail id, board name, and, if it works, the correct digital_rate option to alsa-devel@alsa-project.org [ 682.785084] snd_bt87x 0000:04:01.1: bt87x0: Using board 0, analog, digital (rate 32000 Hz)

The lspci output is: 04:01.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11) Flags: bus master, medium devsel, latency 32, IRQ 18 Memory at f0001000 (32-bit, prefetchable) [size=4K] Capabilities: [44] Vital Product Data Capabilities: [4c] Power Management version 2 Kernel driver in use: bttv Kernel modules: bttv

04:01.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11) Flags: bus master, medium devsel, latency 32, IRQ 18 Memory at f0000000 (32-bit, prefetchable) [size=4K] Capabilities: [44] Vital Product Data Capabilities: [4c] Power Management version 2 Kernel driver in use: snd_bt87x

uname -a Linux ubuntu 5.4.0-52-generic #57-Ubuntu SMP Thu Oct 15 10:57:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Regards,

Tamas