Hello Guys, I have Dell Precision 5520 connected to Dell WD15 with USB-C. The following hardware is connected to WD15: - Dell U3011 2560x1600 Display - Logitech K290 USB Keyboard - Ethernet Cable connected directly to a modem/router from my ISP (250 Mbit/s down, 20 Mbit/s up). Now when I boot Ubuntu 17.04 with mainline kernel 4.13 (the one released about week ago) or with kernel 4.12.11 and the WD15 is plugged in from the beginning, I almost always get a total system freeze short after logging into the desktop session. I narrowed it down to possibly Ethernet-over-USB problem, because the freeze always happens before establishing the ethernet connection (as shown by the connection icon in the top status bar), after the external display is up and displaying desktop properly. Now, when I log into the desktop session with no WD15 dock connected, and I connect it later, everything works fine, no freezes, only occasional mouse hiccups (short move freezes) when Ethernet connectivity is established. Interestingely, my mouse is plugged directly into the laptop USB - it is a wireless Logitech mouse with nano-receiver. Not sure if the "hiccup" is just mouse, or system wide temporary lockup / overload. I don't observe such mouse hiccups later, even on a CPU loaded system. The freeze is not happening when doing sleep / resume. Also Ethernet support through the dock seems to be very unstable particularly on 4.13.x series of kernels. Many times I lost connection totally in the middle of teleconference and could not reestablish it - it looked like the whole NetworkManager locked up and couldn't even be restarted; and the system froze on shutdown when I tried to reboot it. Can you help me debug this? What information / files should I send to you to make it easy to fix? (I'm a programmer, although never did anything with the kernel). The issue remains for a very long time now. I've been observing these freezes since kernel 4.10, there also have been a few kernels in 4.11 series when I thought the issue was fixed, but it turned out the recent kernels still have this problem. It is quite annoying because whenever I need to reboot, I have to remember to plug the dock out. Thanks, Piotr Kołaczkowski -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
