Hi, I've been working with 2 Fedora users who both report that there keyboard and mouse has stopped working after upgrading to 5.7.17 -> 5.8.4 . After some back and forth I have found the following common pattern: 1. Both reporters have a "9 Series Chipset Family USB xHCI Controller" 2. Both reporters have a lo-speed (1.5M) keyboard and mouse connected to that XHCI controller 3. The kbd/mouse gets detected but does not send events. So there seems to be an issue with lo-speed USB interrupt-transfers not working on the "9 Series Chipset Family USB xHCI Controller". One reporter is using a DELL Precicion T5610 laptop, the PCI id of the XHCI controller there is 8086:8cb1 and both 5.7 and 5.8 dmesg say: [ 3.324639] xhci_hcd 0000:00:14.0: hcc params 0x200077c1 hci version 0x100 quirks 0x0000000000009810 [ 3.324643] xhci_hcd 0000:00:14.0: cache line size of 64 is not supported The other reporter is using a Gigabyte H97-D3H motherboard. This reporter reports that plugging the kbd/mouse into the USB ports which are connected to the H97's EHCI controller works around the problem. I have tried to reproduce this on some of my own systems, but I do not have any hardware of this exact generation and I could not reproduce it on the closest hardware which I do have. Matthias, if you have some idea which 4.8 change might have caused this I can build rpms with a test kernel with that change reverted for the reporters to test. Regards, Hans
