Hi I need some help determining if there's been a regression for one of my DVB TV cards. Details below. I have a Hauppage QuadHD DVB card which has two multimedia controllers: Conexant Systems, Inc. CX23887/8 PCIe Broadcast Audio and Video Decoder with 3D Comb (rev 04) i.e. PCI ID 14f1:8880 (rev 04) With subvendor:subdevice 0700:0x6a28. The cards have SiLabs Si2157 tuners. I had a working system running Debian Bullseye (linux 5.10.197-1). After I upgraded to Debian Bookworm (running 6.1.52-1) the tuners in this card no longer get a lock. I also tried a 'backports' kernel, 6.5.10-1~bpo12+1. This is based on the upstream version 6.1.66-1. This kernel also fails to tune and get a lock. The other symptom, which may or may not be relevant, is 'i2cdetect -l' returns nothing, though there are various i2c device detections on dmesg. There is a second card in the system that tunes and locks on just fine, with both the 6.1 and 6.5 kernels. It is a Philips Semiconductors SAA7164 (rev 81) marketed as a (Hauppauge WinTV HVR-2200, i.e. PCI ID 1131:7164, subbvendor:subdevice 0070:8953. So I can rule out lack of signal; the signal is routed into the quad card first and then to the working dual-tuner card. Things I have tried - checking the firmware blobs are all present and loading - setting debug=6 on the cx23885 module - setting tuner_lock_debug=1 on the si2157 module - enabling some dynamic debug, e.g. echo 'file si2157.c +p' >/sys/kernel/debug/dynamic_debug/control - running w_scan under strace - review the kernel commit logs for the cx23885 and si2157 modules So far I am not seeing any helpful error messages or commits that could be causing the problem. Are there some test programs I could run to debug this further? Any help would be welcome
