Update: I switch from ubuntu to Manjaro, using kernel 4.2.2
Huray I am not doomed to be using older kernel such as 3.13 forever.
Here are some additional information aboud neworking card
$ lspci -k
....
02:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01)
Subsystem: Lenovo Device 0611
Kernel driver in use: wl
Kernel modules: bcma, wl
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI
Express Card Reader (rev 01)
Subsystem: Lenovo Device 5100
Kernel driver in use: rtsx_pci
Kernel modules: rtsx_pci
and the driver
https://bbs.archlinux.org/viewtopic.php?id=145884
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https://bugs.launchpad.net/bugs/1471238
Title:
BCM43142 will stop working when signal is below 55%
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