I installed Ubuntu16.04 LTS in Acer-Aspire 5742 laptop. Every thing running well but wifi always hard blocked after 10-15 min.

  1. I tried to add acer_wmi, wmi, wl to blacklist /etc/modprobe.d/blacklist.conf
  2. I also tried to unblock using sudo rfkill unblock all but did not help.
  3. I am ensure wifi is enabled by hardware.

I read multiple threads but no one help me.

Out put of command : lspci -knn | grep Net -A2

01:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM57780 Gigabit Ethernet PCIe [14e4:1692] (rev 01)
    Subsystem: Acer Incorporated [ALI] NetLink BCM57780 Gigabit Ethernet PCIe [1025:036d]
    Kernel driver in use: tg3
    Kernel modules: tg3
02:00.0 Network controller [0280]: Broadcom Corporation BCM43225 802.11b/g/n [14e4:4357] (rev 01)
    Subsystem: Foxconn International, Inc. T77H103.00 Wireless Half-size Mini PCIe Card [105b:e021]
    Kernel driver in use: bcma-pci-bridge
  • Is the wifi getting disconnected constantly? – john400 Aug 20 '16 at 7:17
  • No, when I start , wifi connected properly and working fine . But after 10-15 minute automatically disconnected and I see wifi is blocked by hardware and then unable to connect. – umesh kushwaha Aug 20 '16 at 8:14
  • Please edit your question and add output of lspci -knn | grep Net -A2 terminal command. – Pilot6 Aug 20 '16 at 10:38
  • Try to install the proprietary driver sudo apt install bcmwl-kernel-source. This driver claims to support this adapter. Secure Boot should be disabled if UEFI is used. – Pilot6 Aug 20 '16 at 12:31
  • acer aspire 5742 does not have secure boot option – umesh kushwaha Aug 20 '16 at 13:05

You can try to reactivate your wifi by using

sudo rfkill unblock wifi
| improve this answer | |
  • in question i mention already used, it did not help – umesh kushwaha Aug 20 '16 at 12:03

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