Cronologia
Ieri ho riscontrato uno strano problema (il 13 gennaio 2018). Il mio Ubuntu non è stato in grado di ricevere forti segnali di Wifi. Una volta ho riscontrato questo problema in precedenza e sono stato in grado di risolverlo utilizzando questo post. La soluzione era creare un file di configurazione come segue –
sudo tee /etc/modprobe.d/rtl8723be.conf <<< "options rtl8723be ant_sel=1"
Ma questa volta non funzionava. Ho trovato questo articolo e sono stato in grado di risolvere correttamente il problema del "segnale Wi-Fi debole". Ha chiesto di scaricare i driver da questo repository e installarlo utilizzando
sudo make install
Seguito dall'esecuzione di questi comandi e quindi dalla creazione di un file di configurazione per rendere l'impostazione permanente
sudo modprobe -rv rtl8723be
sudo modprobe -v rtl8723be ant_sel=2
sudo ip link set wlp13s0 up
echo "options rtl8723be ant_sel=2" | sudo tee /etc/modprobe.d/50-rtl8723be.conf
Il problema
Ma presto ho scoperto che l'hotspot che mi piaceva creare dal mio laptop dava una velocità terribile (di soli 0,5 Mbps circa) . La velocità che ottengo sulla mia LAN è di circa 80 Mbps . Sono passato a Windows e ha scoperto che l'hotspot creato offre una velocità Wi-Fi di circa 30 Mbps . Vorrei anche aggiungere che sto usando Speedtest di Ookla e il Ping in ogni speedtest è normale (nell'intervallo da 8 a 10), cosa che prima ottenevo. Quindi non c'è nessun cambiamento nel ping . Ho provato a cercare questo problema ma non sono riuscito a trovare nulla di correlato. Il tuo aiuto sarà apprezzato.
Informazioni correlate
Il mio driver wireless è rtl8723be
Output di iwconfig
enp2s0 no wireless extensions.
lo no wireless extensions.
wlo1 IEEE 802.11 Mode:Master Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:on
Output di ifconfig
enp2s0 Link encap:Ethernet HWaddr a0:8c:fd:4d:1b:0d
inet addr:172.25.30.203 Bcast:172.25.30.255 Mask:255.255.255.0
inet6 addr: fe80::90b5:2747:93a9:f969/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:39347 errors:0 dropped:0 overruns:0 frame:0
TX packets:22188 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:9004186 (9.0 MB) TX bytes:14741038 (14.7 MB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:1608 errors:0 dropped:0 overruns:0 frame:0
TX packets:1608 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:141049 (141.0 KB) TX bytes:141049 (141.0 KB)
wlo1 Link encap:Ethernet HWaddr 74:df:bf:8b:11:17
inet addr:10.42.0.1 Bcast:10.42.0.255 Mask:255.255.255.0
inet6 addr: fe80::76df:bfff:fe8b:1117/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12069 errors:0 dropped:1 overruns:0 frame:0
TX packets:8846 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13285506 (13.2 MB) TX bytes:2959250 (2.9 MB)
Output di lspci | grep Wireless
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter
Output di route
Qui 10.42.0.47 è il mio dispositivo connesso all'hotspot.
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 172.25.30.1 0.0.0.0 UG 100 0 0 enp2s0
10.42.0.0 * 255.255.255.0 U 600 0 0 wlo1
link-local * 255.255.0.0 U 1000 0 0 enp2s0
172.25.30.0 * 255.255.255.0 U 100 0 0 enp2s0
Registro aggiornamenti software recenti
Penso che ci sia un'alta probabilità che il problema sia dovuto all'aggiornamento automatico di alcuni software. Sono sicuro che questo problema è iniziato tra l'8 e l'11 gennaio ed è stato definitivamente scoperto il 13 gennaio.
EDIT #1- Vedo che il kernel è stato aggiornato a v4.13 il 11 Jan . Sospetto che il problema si sia verificato a causa di questo aggiornamento.
EDIT #2- Ho provato a tornare al kernel precedente (v4.10) tramite grub e ho seguito questo post che spiega cosa fare quando il kernel viene aggiornato (o forse anche declassato). Non ha funzionato.
Start-Date: 2018-01-05 10:31:01
Commandline: /usr/bin/unattended-upgrade
Upgrade: ruby2.3:amd64 (2.3.1-2~16.04.2, 2.3.1-2~16.04.4), apport:amd64
(2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), libruby2.3:amd64 (2.3.1-2~16.04.2,
2.3.1-2~16.04.4), python3-apport:amd64 (2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15),
libwebkit2gtk-4.0-37:amd64 (2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1),
apport-gtk:amd64 (2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), gir1.2-webkit2-4.0:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), libjavascriptcoregtk-4.0-18:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), python3-problem-report:amd64
(2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), libwebkit2gtk-4.0-37-gtk2:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), gir1.2-javascriptcoregtk-4.0:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1)
Error: Sub-process /usr/bin/dpkg returned an error code (2)
End-Date: 2018-01-05 10:31:01
Start-Date: 2018-01-07 08:51:55
Commandline: /usr/bin/unattended-upgrade
Upgrade: ruby2.3:amd64 (2.3.1-2~16.04.2, 2.3.1-2~16.04.4), apport:amd64
(2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), libruby2.3:amd64 (2.3.1-2~16.04.2,
2.3.1-2~16.04.4), python3-apport:amd64 (2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15),
libwebkit2gtk-4.0-37:amd64 (2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1),
apport-gtk:amd64 (2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), gir1.2-webkit2-4.0:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), libjavascriptcoregtk-4.0-18:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), python3-problem-report:amd64
(2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), libwebkit2gtk-4.0-37-gtk2:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), gir1.2-javascriptcoregtk-4.0:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1)
Error: Sub-process /usr/bin/dpkg returned an error code (2)
End-Date: 2018-01-07 08:51:55
Start-Date: 2018-01-08 16:34:54
Commandline: /usr/bin/unattended-upgrade
Upgrade: ruby2.3:amd64 (2.3.1-2~16.04.2, 2.3.1-2~16.04.4), apport:amd64
(2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), libruby2.3:amd64 (2.3.1-2~16.04.2,
2.3.1-2~16.04.4), python3-apport:amd64 (2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15),
libwebkit2gtk-4.0-37:amd64 (2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1),
apport-gtk:amd64 (2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), gir1.2-webkit2-4.0:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), libjavascriptcoregtk-4.0-18:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), python3-problem-report:amd64
(2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), libwebkit2gtk-4.0-37-gtk2:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), gir1.2-javascriptcoregtk-4.0:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1)
Error: Sub-process /usr/bin/dpkg returned an error code (2)
End-Date: 2018-01-08 16:34:54
Start-Date: 2018-01-09 16:32:45
Commandline: /usr/bin/unattended-upgrade
Upgrade: ruby2.3:amd64 (2.3.1-2~16.04.2, 2.3.1-2~16.04.4), apport:amd64
(2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), libruby2.3:amd64 (2.3.1-2~16.04.2,
2.3.1-2~16.04.4), python3-apport:amd64 (2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15),
libwebkit2gtk-4.0-37:amd64 (2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1),
apport-gtk:amd64 (2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), gir1.2-webkit2-4.0:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), libjavascriptcoregtk-4.0-18:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), python3-problem-report:amd64
(2.20.1-0ubuntu2.14, 2.20.1-0ubuntu2.15), libwebkit2gtk-4.0-37-gtk2:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1), gir1.2-javascriptcoregtk-4.0:amd64
(2.18.3-0ubuntu0.16.04.1, 2.18.4-0ubuntu0.16.04.1)
End-Date: 2018-01-09 16:34:23
Start-Date: 2018-01-10 16:55:32
Commandline: /usr/bin/unattended-upgrade
Upgrade: poppler-utils:amd64 (0.41.0-0ubuntu1.5, 0.41.0-0ubuntu1.6), linux-libc-dev:amd64
(4.4.0-104.127, 4.4.0-108.131), firefox-locale-en:amd64 (57.0.3+build1-0ubuntu0.16.04.1,
57.0.4+build1-0ubuntu0.16.04.1), firefox:amd64 (57.0.3+build1-0ubuntu0.16.04.1,
57.0.4+build1-0ubuntu0.16.04.1), libpoppler-glib8:amd64 (0.41.0-0ubuntu1.5,
0.41.0-0ubuntu1.6), libpoppler58:amd64 (0.41.0-0ubuntu1.5, 0.41.0-0ubuntu1.6)
End-Date: 2018-01-10 16:56:08
=====================================================================
Start-Date: 2018-01-11 14:39:00
Commandline: /usr/bin/unattended-upgrade
Install: linux-image-4.13.0-26-generic:amd64 (4.13.0-26.29~16.04.2, automatic),
linux-headers-4.13.0-26:amd64 (4.13.0-26.29~16.04.2, automatic),
linux-signed-image-4.13.0-26-generic:amd64 (4.13.0-26.29~16.04.2, automatic),
linux-image-extra-4.13.0-26-generic:amd64 (4.13.0-26.29~16.04.2, automatic),
linux-headers-4.13.0-26-generic:amd64 (4.13.0-26.29~16.04.2, automatic)
Upgrade: linux-libc-dev:amd64 (4.4.0-108.131, 4.4.0-109.132), ruby2.3:amd64
(2.3.1-2~16.04.4, 2.3.1-2~16.04.5), linux-image-generic-hwe-16.04:amd64 (4.10.0.42.44,
4.13.0.26.46), linux-signed-generic-hwe-16.04:amd64 (4.10.0.42.44, 4.13.0.26.46),
linux-generic-hwe-16.04:amd64 (4.10.0.42.44, 4.13.0.26.46),
linux-signed-image-generic-hwe-16.04:amd64 (4.10.0.42.44, 4.13.0.26.46), libruby2.3:amd64
(2.3.1-2~16.04.4, 2.3.1-2~16.04.5), linux-headers-generic-hwe-16.04:amd64 (4.10.0.42.44,
4.13.0.26.46)
End-Date: 2018-01-11 14:42:54
=====================================================================
Start-Date: 2018-01-13 15:57:28
Commandline: apt upgrade
Requested-By: rohan (1000)
Install: libllvm5.0:amd64 (1:5.0-3~16.04.1, automatic), libdrm-common:amd64
(2.4.83-1~16.04.1, automatic)
Upgrade: suru-icon-theme:amd64 (14.04+16.04.20161024-0ubuntu1,
14.04+16.04.20171116-0ubuntu1), libgles2-mesa:amd64 (17.0.7-0ubuntu0.16.04.2,
17.2.4-0ubuntu1~16.04.2), libseccomp2:amd64 (2.2.3-3ubuntu3, 2.3.1-2.1ubuntu2~16.04.1),
intel-microcode:amd64 (3.20170707.1~ubuntu16.04.0, 3.20180108.0~ubuntu16.04.2),
libdrm-nouveau2:amd64 (2.4.76-1~ubuntu16.04.1, 2.4.83-1~16.04.1), libgweather-3-6:amd64
(3.18.2-0ubuntu0.1, 3.18.2-0ubuntu0.2), grub-common:amd64 (2.02~beta2-36ubuntu3.14,
2.02~beta2-36ubuntu3.15), libglapi-mesa:amd64 (17.0.7-0ubuntu0.16.04.2,
17.2.4-0ubuntu1~16.04.2), snapd:amd64 (2.28.5, 2.29.4.2), squashfs-tools:amd64
(1:4.3-3ubuntu2, 1:4.3-3ubuntu2.16.04.1), google-chrome-stable:amd64 (63.0.3239.108-1,
63.0.3239.132-1), libxatracker2:amd64 (17.0.7-0ubuntu0.16.04.2, 17.2.4-0ubuntu1~16.04.2),
grub2-common:amd64 (2.02~beta2-36ubuntu3.14, 2.02~beta2-36ubuntu3.15), libegl1-mesa:amd64
(17.0.7-0ubuntu0.16.04.2, 17.2.4-0ubuntu1~16.04.2), initramfs-tools-bin:amd64
(0.122ubuntu8.9, 0.122ubuntu8.10), libgbm1:amd64 (17.0.7-0ubuntu0.16.04.2,
17.2.4-0ubuntu1~16.04.2), adapta-gtk-theme:amd64 (3.92.2.57-0ubuntu1~xenial1,
3.93.0.38-0ubuntu1~xenial1), libdrm-amdgpu1:amd64 (2.4.76-1~ubuntu16.04.1,
2.4.83-1~16.04.1), grub-efi-amd64-bin:amd64 (2.02~beta2-36ubuntu3.14,
2.02~beta2-36ubuntu3.15), libwayland-egl1-mesa:amd64 (17.0.7-0ubuntu0.16.04.2,
17.2.4-0ubuntu1~16.04.2), ubuntu-core-launcher:amd64 (2.28.5, 2.29.4.2), libdrm2:amd64
(2.4.76-1~ubuntu16.04.1, 2.4.83-1~16.04.1), libwebkit2gtk-4.0-37:amd64
(2.18.4-0ubuntu0.16.04.1, 2.18.5-0ubuntu0.16.04.1), ubuntu-mobile-icons:amd64
(14.04+16.04.20161024-0ubuntu1, 14.04+16.04.20171116-0ubuntu1), libgl1-mesa-dri:amd64
(17.0.7-0ubuntu0.16.04.2, 17.2.4-0ubuntu1~16.04.2), grub-efi-amd64:amd64
(2.02~beta2-36ubuntu3.14, 2.02~beta2-36ubuntu3.15), xserver-xorg-core-hwe-16.04:amd64
(2:1.19.3-1ubuntu1~16.04.4, 2:1.19.5-0ubuntu2~16.04.1), light-themes:amd64
(14.04+16.04.20161024-0ubuntu1, 14.04+16.04.20171116-0ubuntu1), ubuntu-artwork:amd64
(1:14.04+16.04.20161024-0ubuntu1, 1:14.04+16.04.20171116-0ubuntu1), libgl1-mesa-glx:amd64
(17.0.7-0ubuntu0.16.04.2, 17.2.4-0ubuntu1~16.04.2), grub-efi-amd64-signed:amd64
(1.66.14+2.02~beta2-36ubuntu3.14, 1.66.15+2.02~beta2-36ubuntu3.15),
gir1.2-webkit2-4.0:amd64 (2.18.4-0ubuntu0.16.04.1, 2.18.5-0ubuntu0.16.04.1),
unattended-upgrades:amd64 (0.90ubuntu0.8, 0.90ubuntu0.9), libdrm-intel1:amd64
(2.4.76-1~ubuntu16.04.1, 2.4.83-1~16.04.1), libdrm-radeon1:amd64 (2.4.76-1~ubuntu16.04.1,
2.4.83-1~16.04.1), xserver-xorg-legacy-hwe-16.04:amd64 (2:1.19.3-1ubuntu1~16.04.4,
2:1.19.5-0ubuntu2~16.04.1), mesa-vdpau-drivers:amd64 (17.0.7-0ubuntu0.16.04.2,
17.2.4-0ubuntu1~16.04.2), libjavascriptcoregtk-4.0-18:amd64 (2.18.4-0ubuntu0.16.04.1,
2.18.5-0ubuntu0.16.04.1), ubuntu-mono:amd64 (14.04+16.04.20161024-0ubuntu1,
14.04+16.04.20171116-0ubuntu1), libgweather-common:amd64 (3.18.2-0ubuntu0.1,
3.18.2-0ubuntu0.2), initramfs-tools-core:amd64 (0.122ubuntu8.9, 0.122ubuntu8.10),
initramfs-tools:amd64 (0.122ubuntu8.9, 0.122ubuntu8.10), libwebkit2gtk-4.0-37-gtk2:amd64
(2.18.4-0ubuntu0.16.04.1, 2.18.5-0ubuntu0.16.04.1), gir1.2-javascriptcoregtk-4.0:amd64
(2.18.4-0ubuntu0.16.04.1, 2.18.5-0ubuntu0.16.04.1)
End-Date: 2018-01-13 16:00:19
Start-Date: 2018-01-13 18:09:45
Commandline: apt install papirus-icon-theme
Requested-By: rohan (1000)
Install: libreoffice-style-papirus:amd64 (20170914-44+pkg3~ubuntu16.04.1, automatic),
papirus-icon-theme:amd64 (20180113-2047+pkg17~ubuntu16.04.1)
End-Date: 2018-01-13 18:10:12
Start-Date: 2018-01-13 18:14:39
Commandline: apt-get install arc-theme
Requested-By: rohan (1000)
Install: gnome-themes-standard:amd64 (3.18.0-2ubuntu1, automatic),
gnome-themes-standard-data:amd64 (3.18.0-2ubuntu1, automatic), arc-theme:amd64
(1488477732.766ae1a-0)
End-Date: 2018-01-13 18:14:43
Start-Date: 2018-01-13 21:22:41
Commandline: apt autoremove
Requested-By: rohan (1000)
Remove: linux-image-4.10.0-40-generic:amd64 (4.10.0-40.44~16.04.1),
linux-signed-image-4.10.0-40-generic:amd64 (4.10.0-40.44~16.04.1), libllvm4.0:amd64
(1:4.0-1ubuntu1~16.04.2), linux-image-extra-4.10.0-40-generic:amd64
(4.10.0-40.44~16.04.1), linux-headers-4.10.0-40:amd64 (4.10.0-40.44~16.04.1),
linux-headers-4.10.0-40-generic:amd64 (4.10.0-40.44~16.04.1)
End-Date: 2018-01-13 21:24:20
Risposta accettata:
Penso che la gestione dell'alimentazione wifi sia responsabile delle basse velocità, può essere disabilitata con
echo "options rtl8723be ips=0" | sudo tee -a /etc/modprobe.d/50-rtl8723be.conf
sudo sed -i 's/wifi.powersave = 3/wifi.powersave = 2/' /etc/NetworkManager/conf.d/default-wifi-powersave-on.confRiavvia
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