Hauppauge QuadHD PCIe - only two tuners working

Server Version#: 1.41.1.9057
Player Version#: N/A
Tuner Make/Model: Hauppauge QuadHD PCIe
Guide/Lineup name: N/A
Using XMLTV?: N/A
Channel number/Name: N/A
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

Trying to figure out an issue with my Hauppauge QuadHD card. I’ve been using it for years with the mediatree kernel per Hauppauge’s website. I updated my system from Mint 21 (5.15 kernel series) to Mint 22 (6.8 series) and can’t seem to use more than two of my tuners. This scenario used to be caused by running a generic kernel vs. the mediatree version. However, it would appear that dmesg shows all four tuners are found (adapter0, 1, 2, 3) per this example:

[   23.409617] cx23885 0000:07:00.0: DVB: registering adapter 2 frontend 0 (LG Electronics LGDT3306A VSB/QAM Frontend)...
[   23.409899] cx23885: cx23885_dvb_register() allocating 1 frontend(s)
[   23.409902] cx23885: cx23885[1]: cx23885 based dvb card
[   23.409903] cx23885: dvb_register(): board=57 port=2
[   23.417105] si2157 5-0062: Silicon Labs Si2157 successfully attached

I also see that all four tuners show up in the Plex logs, but with a warning:

Nov 01, 2024 11:22:13.008 [0x7c8dbb3f3b38] INFO - [I] v4l::DeviceGetList_impl. Successfully opened frontend /dev/dvb/adapter0/frontend0
Nov 01, 2024 11:22:13.012 [0x7c8dbb3f3b38] INFO - [I] v4l::DeviceGetList_impl. Successfully opened frontend /dev/dvb/adapter1/frontend0
Nov 01, 2024 11:22:13.016 [0x7c8dbb3f3b38] INFO - [I] v4l::DeviceGetList_impl. Successfully opened frontend /dev/dvb/adapter2/frontend0
Nov 01, 2024 11:22:13.020 [0x7c8dbb3f3b38] INFO - [I] v4l::DeviceGetList_impl. Successfully opened frontend /dev/dvb/adapter3/frontend0
Nov 01, 2024 11:22:13.024 [0x7c8dbb3f3b38] WARN - [E] web_service_t::get_device_status. Failed to make compound device for device uuid dvb#v4l#/sys/devices/pci0000:00/0000:00:09.0/0000:02:00.0/0000:03:02.0/0000:05:00.0:14f1:8880

I’ve posted this issue to the mediatree kernel maintainer and am looking for help here to determine if this is a Plex issue or a kernel issue. Thanks in advance.

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