On Sat, Sep 16, 2017 at 03:02:58PM +0200, Piotr Kołaczkowski wrote: > Hello! > > TL;DR: > I'm having troubles with Dell WD15 dock connected to USB-C of Dell > Precision 5520 laptop. > I'm seeing very frequent kernel freezes, sometimes panics, > particularly on logging into the desktop session. > I first created a ticket on Ubuntu Launchpad, but I have been directed > to here. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1701499 > > I've tried sending email to the linux-usb list from my private > address, pkolaczk@xxxxxxxxx, but somehow I didn't get any answer - > maybe my email didn't get through or just some incompatibility between > gmail and majordomo (or I don't know how to use it properly). If you > received a similar email previously, I'm sorry for duplicate. html email is rejected by the mailing lists, odds are that is what happened there. > Please at least confirm this email got to the list, because Gmail does > not display it in the inbox... Thanks. > > As for the problems. > > Hardware: > - Dell Precision 5520 Laptop > - WD15 USB-C Dock > - External Dell U3011 display connected to the dock > - Ethernet cable connected to the dock > - wireless Logitech USB mouse, connected to the laptop directly (nano-receiver) > - Logitech K290 keyboard connected to USB port of the dock > > Software: > - Linux 4.12.13 / Linux 4.13.2 taken from Ubuntu ppa/mainline - either > version has this problem(s). > - Bios version: 1.5.0 > - WD15 firmware: updated yesterday > > Problems: > - If booted with the dock connected, system almost always totally > freezes right after logging into desktop session, always after > displaying the desktop and activating the external display, but before > establishing the ethernet connection. Freeze is total, can't move > mouse pointer, can't switch to TTY with Ctrl-Alt-F1. > - Hotplugging the dock after getting to the grahical login screen > works fine, but attempt to log in ends with freeze just as in the > previous point. > - Sometimes the system doesn't freeze, but ethernet connection doesn't come up. > - Sometimes ethernet connection disconnects and can't be reestablished > without reboot. > - System sometimes fails to resume in the following scenarios: > -- suspend, disconnect dock, resume > -- suspend, connect the dock, resume > > What works fine: > - Suspend/resume without connecting/disconnecting the dock seems to be > working almost always fine. > - Hotplugging the dock after starting the desktop session works fine > (and is the only reliable workaround for the issue). > - System never freezes before showing LightDM login screen, and at > this point, external display, keyboard and ethernet connection work > fine. > - Laptop alone with no dock connected is perfectly stable. > > I didn't spot anything suspicious repeating in the syslog. There have > been some General Protection Faults logged sometimes, but not every > freeze causes logging any error information. > I can send you some recent syslogs, if you wish. Having a kernel log for when something goes wrong would be great to have those faults tell us a lot about what the problem might be. Care to send them? Also, check to ensure that you have the latest BIOS update from Dell, they have been fixing a lot of USB/Thunderbolt issues lately in them, and I know my Dell laptops just resolved a lot of issues like this with docking stations when I updated the BIOS. Also, is this one of the docking stations that needs the firmware updated? There are 2 different ones, one a small one the size of a matchbox, and the other a very large one with a huge power supply. The larger one can have its firmware updated and that would also be something to check that you have the latest version (I don't know if you can update it from Linux only, sorry, last time I looked I couldn't figure it out, but that was over a year ago...) thanks, greg k-h -- 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
