from
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/771758/comments/8
and
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/771758/comments/9:
I have tried pretty much all combinations of the brcm80211, wl, and
acer_wmi modules on my Lenovo IdeaPad U160 and here's what I've found.
The brcm80211 module/driver doesn't work under any conditions.
If I boot normally, with the acer_wmi and wl modules loaded
automatically, then wifi doesn't work because of rfkill but I can't
unblock them until I "sudo modprobe -r acer_wmi". Then wifi works fine.
If I blacklist acer_wmi, wifi doesn't work again because of rfkill, but
this time I can't unblock it until I "sudo modprobe acer_wmi" and then
remove it again with "sudo modprobe -r acer_wmi".
So it seems like the acer_wmi module is doing some sort of necessary
initialization without which the wl module and rfkill can't work. Hope
that helps track down the real bug.
I fixed the problem on my U160 by abusing /etc/modprobe.d/broadcom-sta-
common.conf. I replaced:
install wl /sbin/modprobe --ignore-install wl $CMDLINE_OPTS
with:
softdep wl pre: acer_wmi
install wl /sbin/modprobe --ignore-install wl $CMDLINE_OPTS && rflist
unblock all
install acer_wmi /sbin/modprobe --ignore-install acer_wmi $CMDLINE_OPTS &&
/sbin/modprobe -r acer_wmi
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https://bugs.launchpad.net/bugs/668234
Title:
acer_wmi is blocking wireless on Ideapad S12
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