I have been using Linux Mint 17.2 (Cinammon 64-bit) on my Lenovo Z580 laptop for 3 years now and I am pretty satisfied with it. However, around two months ago a strange problem has started: The WiFI randomly disconnects and the only way to connect again is to restart my laptop. Also, when it disconnects all the available networks disappear from the network manager.
I know there is a similar topic just a few posts below but I tried both the solutions (power management and disabling IPv6) and they didn't work. Also, it's not a problem of the internet itself because all other devices are connected fine.
The internet controllers (as given by lspci -vq) are as follows:
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02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller (rev 05) Subsystem: Lenovo Device 3975 Flags: bus master, fast devsel, latency 0, IRQ 25 I/O ports at 2000 [size=256] Memory at f0404000 (64-bit, prefetchable) [size=4K] Memory at f0400000 (64-bit, prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: r8169 03:00.0 Network controller: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) (rev 01) Subsystem: Lenovo Device 31a1 Flags: bus master, fast devsel, latency 0, IRQ 18 Memory at f0500000 (64-bit, non-prefetchable) [size=64K] Capabilities: <access denied> Kernel driver in use: ath9k
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lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:"VM_2" Mode:Managed Frequency:2.462 GHz Access Point: 40:0D:10:D5:FA:61 Bit Rate=65 Mb/s Tx-Power=15 dBm Retry short limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=70/70 Signal level=-33 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:88 Missed beacon:0 eth0 no wireless extensions.