Messages in this thread | | | Date | Mon, 8 Jun 2009 16:20:03 -0400 (EDT) | From | Alan Stern <> | Subject | Re: PROBLEM: Removing Huawei E220 HSDPA Modem causes system to completely hang |
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On Mon, 8 Jun 2009, Jiri Kosina wrote:
> [ added linux-usb to CC and kept the whole original mail for reference ] > > On Mon, 8 Jun 2009, Jonathan Cervidae wrote: > > > While at first the easy fix to this issue would be "Don't remove modem", > > sometimes it resets itself and therefore appears to disconnect and > > reconnect which causes the system crash. > > What is the product ID of the device? (lsusb will tell you). > > > I can reproduce the problem 80% of the time by ripping the modem out of > > the USB port. However, if I kill -9 pppd before doing it, it never > > happens so the problem appears to be an interaction between pppd and the > > kernel. As full system lockups in my limited knowledge must be kernel > > problems since systems should never fully lock (with flashing caps lock > > and scroll lock lights, not responsive to magic sysreq keys) presumably > > this is a kernel bug. > > > > It also did not happen until recently, some point within the last month. I > > would have reported it earlier (and reverted to a kernel that didn't do it) > > but didn't realise why it was happening.
Two patches for usb-serial drivers were posted recently to fix this sort of problem:
http://marc.info/?l=linux-usb&m=124395806322087&w=2 http://marc.info/?l=linux-usb&m=124395806222085&w=2
See if the two of them together solve everything.
Alan Stern
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