I'm glad you started this thread Gullik. I too am keen to see the vertical port and USB-C work. So far, running 6.8rc1, they don't. I haven't tried the collabora kernel yet on my OPi5, have you? That is off of collabora's branch, so has the latest patches that haven't been upstreamed yet, but the latest release of that is on 6.7.0.
Separately, I have an issue with even the two horizontal USB ports. When using a 2.5" portable HDD, normally things work ok, but heavy activity, usually when I'm rsync'ing, leads to USB disconnects. Is anyone seeing this?
[1294682.126819] usb 2-1: USB disconnect, device number 8
[1294682.127247] sd 3:0:0:0: [sdf] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s
[1294682.127256] sd 3:0:0:0: [sdf] tag#0 CDB: Read(10) 28 00 00 0e 59 d8 00 00 08 00
[1294682.127261] blk_print_req_error: 4 callbacks suppressed
[1294682.127263] I/O error, dev sdf, sector 940504 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[1294682.139910] device offline error, dev sdf, sector 940504 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[1294682.139931] buffer_io_error: 256 callbacks suppressed
[1294682.139934] Buffer I/O error on dev sdf1, logical block 117307, async page read
[1294682.140082] device offline error, dev sdf, sector 361648 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[1294682.140105] device offline error, dev sdf, sector 361648 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[1294682.140109] Buffer I/O error on dev sdf1, logical block 44950, async page read
[1294682.140442] device offline error, dev sdf, sector 2235835648 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[1294682.140461] device offline error, dev sdf, sector 2235835648 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[1294682.140464] Buffer I/O error on dev sdf1, logical block 279479200, async page read
[1294682.140617] device offline error, dev sdf, sector 359856 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[1294682.140629] device offline error, dev sdf, sector 359856 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[1294682.140632] Buffer I/O error on dev sdf1, logical block 44726, async page read
[1294682.141065] device offline error, dev sdf, sector 941832 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[1294682.141114] device offline error, dev sdf, sector 941832 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[1294682.141126] Buffer I/O error on dev sdf1, logical block 117473, async page read
[1294682.141452] Buffer I/O error on dev sdf1, logical block 44798, async page read
[1294682.159672] Buffer I/O error on dev sdf1, logical block 44683, async page read
[1294682.162683] Buffer I/O error on dev sdf1, logical block 115454, async page read
[1294682.164797] Buffer I/O error on dev sdf1, logical block 44930, async page read
[1294682.170128] Buffer I/O error on dev sdf1, logical block 44756, async page read
[1294683.623276] sd 3:0:0:0: [sdf] Synchronizing SCSI cache
[1294683.623322] sd 3:0:0:0: [sdf] Synchronize Cache(10) failed: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[1294683.899994] usb 2-1: new SuperSpeed USB device number 9 using xhci-hcd
[1294683.918703] usb 2-1: New USB device found, idVendor=0480, idProduct=0900, bcdDevice= 3.15
[1294683.918714] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1294683.918720] usb 2-1: Product: External USB 3.0