https://bugzilla.kernel.org/show_bug.cgi?id=217434 Bug ID: 217434 Summary: SuperSpeed+ speed reporting wrong from Asmedia ASM3242 Product: Drivers Version: 2.5 Hardware: All OS: Linux Status: NEW Severity: normal Priority: P3 Component: USB Assignee: drivers_usb@xxxxxxxxxxxxxxxxxxxxxx Reporter: james@xxxxxxxxxxxx Regression: No I have a PCIe plugin card with an Asmedia ASM3242 controller, PCI ID 1b21:3242, that supports a 20Gbps transfer rate. SuperSpeed+ devices do connect at 10 and 20Gbps where supported, but lsusb -t always reports that they are connected at 5Gbps. The devices I've tested this with are: - 10Gbps USB hub - RTL9210B based NVME enclosure, 10Gbps - ASM236X based NVME enclosure, 20Gbps I believe the NVME enclosures are connecting at the stated speeds from observing their measured transfer rates (which would be impossible otherwise). This issue has been discussed already on linux-usb: [1] https://marc.info/?l=linux-usb&m=161527212127481&w=2 and later when I encountered it: [2] https://marc.info/?l=linux-usb&m=168046080403282&w=2 I applied Thinh's patch from the discussion under [1] ('capture the device speed from sublink speed notification') to Linux 6.2.9 and it corrected the behaviour, but as noted in [2] this was a test-of-concept patch and a proper xHCI quirk is needed. Unfortunately this is somewhat beyond this reporter's ability -- hence I've made this KBZ entry, mainly so the issue doesn't get lost. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
