Malte Wedel <[email protected]> wrote: > Hello Misc, > > I have OpenBSD running on a Thinkpad X1 Carbon, 3rd Gen, everything is > working great, except for the builtin 4G modem "umb0" which detaches and > disappears from time to time and needs a reboot to become available > again. I found this thread which seems to be exactly my issue: > > http://openbsd-archive.7691.n7.nabble.com/Re-Current-197-Nov-5-umb0-ucom0-umodem0-detached-td330969.html > > When the issue occurs, the following is written into /var/log/messages: > > May 3 14:42:09 carbon /bsd: umb0 detached > May 3 14:42:09 carbon /bsd: ucom0 detached > May 3 14:42:09 carbon /bsd: umodem0 detached
I suspect this detachment is caused by the driver violating the protocol, and the device gives up. > May 3 14:42:26 carbon /bsd: uhub0: port 4, set config 0 at addr 2 failed > May 3 14:42:26 carbon /bsd: uhub0: device problem, disabling port 4 This is a different problem, and is believed to be a race condition on port power-up. This problem has been moving around for years...
