Cross-referenced with Linux 7.1 xhci-pci.c EP_LIMIT_QUIRK.
Intel Panther Point (0x9c31) xHCI controllers have a hardware bug
where endpoints beyond 15 are unreliable. When the quirk is active,
cap endpoints per device at 15 instead of 31 (the xHCI architectural
limit). Without this, devices with many interfaces (USB audio
interfaces, composite devices) will experience random failures.
Quirk enforcement count: 6→7/50 (EP_LIMIT_QUIRK added).
Red Bear OS
947475a2ed