Obviously the previous comment is very old, but I'm afraid it is based
on a misunderstanding of the respective feature sets of mod_limitipconn
and mod_bw.
mod_bw allows you to specify a collection of IP addresses, and a total
aggregate limit on the number of connections allowed from that
If you're looking for a workaround, the current default Ubuntu 16.04.5
kernel doesn't have this bug, and doesn't require PPAs.
apt-get install --install-recommends linux-generic-hwe-16.04
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I built 4.4.0-141.167 with the one-line patch from
https://www.spinics.net/lists/linux-usb/msg168861.html and it does
indeed fix this problem.
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https://bugs.launchpad.net/bugs/1803929
Kai-Heng Feng: I did the bisection and the culprit is
[9021f2295af1af93416aea20c7b72390919f122d] xhci: Fix use-after-free in
xhci_free_virt_device
This commit exists upstream, and the problem has already been fixed upstream:
https://www.spinics.net/lists/linux-usb/msg168861.html
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OK, false alarm -- 4.4.0-140 is now crashing for me as well. As far as I
know nothing has changed between now and yesterday. Same computer, same
drives, everything. Back to 4.4.0-138 for me.
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I experienced the problem 100% of the time on 4.4.0-139. However, unlike
Jan, I just tried 4.4.0-140 and the problem is gone. I will continue
monitoring my system to see if it reappears.
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I applied the Intel IMEI update and now I can reach pc6 and pc7 pretty
consistently but never pc8, pc9, or pc10. Does this agree with your
observations? Using a T460s with NVMe and kernel 4.4.0-36-generic #55 on
16.04, no powertop tuning. All combinations of AC/battery and display
on/off were
nils-anders, I investigated a little more and discovered that the modem
is non-functional when TLP is installed. Are you perhaps using TLP? If
so, that's the likely culprit. If not, there may also be other kernel
modules interfering. Check in
/lib/modules/4.4.0-36-generic/updates/dkms/ and see.
Did you test your SIM in Windows?
Are you using LTE? I haven't successfully connected on 3G yet.
Here's what it looks like for me (phone numbers etc. redacted):
Sep 06 13:08:39 t460s NetworkManager[3225]: [1473181719.2172] device
(cdc-wdm0): Activation: starting connection 'Fido Default'
A day of usage reveals a slightly bigger problem: the connection
completely disappears from NetworkManager if you suspend and resume,
with no way to bring it back online other than rebooting.
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After many months, I finally got this modem working in Xenial (Thinkpad
T460s). Install the libqmi 1.16.0, libmbim 1.14.0, and modemmanager
1.6.0 packages from Yakkety Yak, and make sure you're on kernel
4.4.0-36-generic #55. Reboot and everything should Just Work, assuming
your SIM card is indeed
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