System: openSUSE Leap 15.4; KDE Plasma 5.26.4; KDE Frameworks 5.100.0; Qt 5.15.7; Kernel 5.14.21-150400.24.33-default (64-bit); Graphics X11 Motherboard Gigabyte Z490 VISION G with sound card inbuilt. Problem: Recently purchased a Logitech Z906 5.1 sound system, but I'm having various problems in connecting it properly to the inbuilt sound card which is identified in Yast as Comet Lake PCH cAVS. Some things work; some don't. The principal difficulty is that it won't connect using the Logitech-recommended three TRS "six-channel direct" connectors. When I try to use them as the source for input to the Z906, the System Settings audio module identifies the connection as digital SPDIF, which it isn't, and all I get is silence. I can't check the alternative digital optical or digital coaxial connectors because the motherboard inbuilt device doesn't have them. The only way I can connect successfully is by using a single stereo TRS plug from the motherboard unit's Line Out socket with a conversion cable to two RCA stereo plugs at the Z906 end. That produces 5.1 sound on the face of it, but won't be taking full advantage of the capabilities of the Z906. I say it works, but it does so only in that it produces sound from each of the 5.1 speakers, even though the Audio module in System Settings shows only the Front Left and Front Right units. So, obviously, something's not right. Is there a sound system guru somewhere who can help me establish a working connection in this system between the motherboard sound unit and the Z906 using Logitech's supplied six-channel direct connectors? -- Robin K Wellington "Harbour City" New Zealand