Depois de instalar o ubuntu 16.04 no meu HP eu imediatamente encontrei problemas de wifi: o alcance do wifi era tão fraco que eu tive que ficar ao lado do roteador, caso contrário ele notifica connection out of range . Então eu procurei na web e encontrei este guia: link
Lá eu encontrei a solução e minha internet começou a funcionar perfeitamente. dois dias atrás, o problema saiu novamente. Tentei seguir o procedimento descrito no guia anterior, pois li que você precisa repetir esse procedimento após cada atualização do kernel, mas desta vez não funcionou.
esta é a saída do comando sudo lshw -c network , se você precisar:
*-network
description: Ethernet interface
product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: enp2s0
version: 07
serial: 70:5a:0f:92:e2:9d
size: 10Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8106e-1_0.0.1 06/29/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:124 ioport:4000(size=256) memory:a1200000-a1200fff memory:a1000000-a1003fff
*-network
description: Wireless interface
product: RTL8723BE PCIe Wireless Network Adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlp3s0
version: 00
serial: 44:1c:a8:42:47:8f
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8723be driverversion=4.4.0-59-generic firmware=N/A ip=192.168.1.5 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:17 ioport:3000(size=256) memory:a1100000-a1103fff
e esta é a saída de iwconfig :
wlp3s0 IEEE 802.11bgn ESSID:"Vodafone-26192315"
Mode:Managed Frequency:2.442 GHz Access Point: 00:24:89:79:A8:78
Bit Rate=72.2 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=44/70 Signal level=-66 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:345 Missed beacon:0
enp2s0 no wireless extensions.
lo no wireless extensions.
saída de grep [[:alnum:]] /sys/module/rtl8723be/parameters/*
/sys/module/rtl8723be/parameters/ant_sel:2
/sys/module/rtl8723be/parameters/debug:0
/sys/module/rtl8723be/parameters/disable_watchdog:N
/sys/module/rtl8723be/parameters/fwlps:N
/sys/module/rtl8723be/parameters/ips:N
/sys/module/rtl8723be/parameters/msi:N
/sys/module/rtl8723be/parameters/swenc:Y
/sys/module/rtl8723be/parameters/swlps:N