Thanks Hui for the new kernel. It is not fully working yet though. I attach the two "dmesg --color=always" output for your comparison.
Using your new kernel, my Pi 4B can load g_ether successfully with Ubuntu. However, OTG mode is still not working as expected. Connected to my L470 running Ubuntu 19.10, P4B on ubuntu gives: ----- this is output from dmesg on L470 ----- [114144.192312] usb 1-3.1: new high-speed USB device number 15 using xhci_hcd [114144.572780] usb 1-3.1: device descriptor read/64, error -71 [114160.102412] usb 1-3.1: device descriptor read/64, error -110 [114160.287331] usb 1-3.1: new high-speed USB device number 16 using xhci_hcd [114165.734418] usb 1-3.1: device descriptor read/64, error -110 [114181.606824] usb 1-3.1: device descriptor read/64, error -110 [114181.712895] usb 1-3-port1: attempt power cycle [114182.324401] usb 1-3.1: new high-speed USB device number 17 using xhci_hcd [114187.750644] usb 1-3.1: device descriptor read/64, error -110 [114203.622447] usb 1-3.1: device descriptor read/64, error -110 [114203.806762] usb 1-3.1: new high-speed USB device number 18 using xhci_hcd [114209.253645] usb 1-3.1: device descriptor read/64, error -110 [114225.126520] usb 1-3.1: device descriptor read/64, error -110 [114225.233412] usb 1-3-port1: unable to enumerate USB device when I boot my Pi 4B on Raspbian, the output is as expected: ----- this is output from dmesg on L470 ----- [114365.055969] usb 1-3.1: new high-speed USB device number 19 using xhci_hcd [114365.146823] usb 1-3.1: New USB device found, idVendor=0525, idProduct=a4a2, bcdDevice= 4.19 [114365.146837] usb 1-3.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [114365.146844] usb 1-3.1: Product: RNDIS/Ethernet Gadget [114365.146849] usb 1-3.1: Manufacturer: Linux 4.19.93-v7l+ with fe980000.usb [114365.161097] cdc_subset: probe of 1-3.1:1.0 failed with error -22 [114365.162862] cdc_subset 1-3.1:1.1 usb0: register 'cdc_subset' at usb-0000:00:14.0-3.1, Linux Device, 7a:e4:85:af:64:35 [114365.162980] usbcore: registered new interface driver cdc_subset [114365.163051] cdc_ether: probe of 1-3.1:1.0 failed with error -16 [114365.163119] usbcore: registered new interface driver cdc_ether Any suggestion? I simply use some random values as g_ether module parameters. ** Attachment added: "dmesgs.tgz" https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1861070/+attachment/5323811/+files/dmesgs.tgz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861070 Title: Raspberry Pi 4B: USB OTG is not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1861070/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
