Bonjour,
Depuis nôtre dernière discussion , je n'ai pas trouvé la façon de configurer ma box pour forcer la connexion wifi à 2.4 Ghz au lieu de 5Ghz. Par contre en utilisant une clé wi fi moins récente celle ci se connecte à 2.4Ghz, ce qui résout mon problème. Je n'ai installé aucun pilote particulier pour cette nouvelle clé wifi et l'accès réseau fonctionne parfaitement, peut être sont ils intégrés à l'installation de Ubuntu? Peut on voir si tout est bien configuré? ci joint le résultat de wificheck
>> cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.3 LTS"
>> lsusb
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 004: ID 0bda:8172 Realtek Semiconductor Corp. RTL8191SU 802.11n WLAN Adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 003: ID 09da:032b A4Tech Co., Ltd. Wireless Mouse (Battery Free)
Bus 003 Device 002: ID 047d:2043 Kensington
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
>> lspci -k -nn | grep -A 3 -i net
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 03)
Subsystem: ASUSTeK Computer Inc. M4A785/P7P55 Motherboard [1043:83a3]
Kernel driver in use: r8169
Kernel modules: r8169
>> sudo lshw -C network
*-network
description: Ethernet interface
produit: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
fabriquant: Realtek Semiconductor Co., Ltd.
identifiant matériel: 0
information bus: pci@0000:02:00.0
nom logique: enp2s0
version: 03
numéro de série: 90:e6:ba:cf:c5:54
taille: 100Mbit/s
capacité: 1Gbit/s
bits: 64 bits
horloge: 33MHz
fonctionnalités: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full firmware=rtl_nic/rtl8168d-2.fw ip=192.168.1.69 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
ressources: irq:18 portE/S:d800(taille=256) mémoire:fdfff000-fdffffff mémoire:fdff8000-fdffbfff mémoire:feaf0000-feafffff
*-network
description: Interface réseau sans fil
identifiant matériel: 1
information bus: usb@1:6
nom logique: wlxd8eb97233e4d
numéro de série: d8:eb:97:23:3e:4d
fonctionnalités: ethernet physical wireless
configuration: broadcast=yes driver=r8712u ip=192.168.1.7 multicast=yes wireless=IEEE 802.11bgn
>> lsmod | sort
ahci 40960 2
asus_atk0110 24576 0
autofs4 45056 2
ccp 86016 0
cfg80211 679936 1 rtl8812au
crc_itu_t 16384 1 firewire_core
drm 483328 8 drm_kms_helper,radeon,ttm
drm_kms_helper 180224 1 radeon
edac_mce_amd 28672 0
fb_sys_fops 16384 1 drm_kms_helper
firewire_core 65536 1 firewire_ohci
firewire_ohci 40960 0
hid 126976 2 usbhid,hid_generic
hid_generic 16384 0
i2c_algo_bit 16384 1 radeon
i2c_piix4 28672 0
input_leds 16384 0
ip_tables 32768 0
irqbypass 16384 1 kvm
k10temp 16384 0
kvm 647168 0
ledtrig_audio 16384 1 snd_hda_codec_generic
libahci 32768 1 ahci
lp 20480 0
mac_hid 16384 0
Module Size Used by
parport 53248 3 parport_pc,lp,ppdev
parport_pc 36864 1
pata_acpi 16384 0
pata_atiixp 16384 0
ppdev 24576 0
psmouse 151552 0
r8169 86016 0
r8712u 172032 0
radeon 1449984 16
realtek 20480 1
rtl8812au 1347584 0
sch_fq_codel 20480 3
serio_raw 20480 0
snd 86016 19 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_timer,snd_hda_codec_via,snd_pcm,snd_rawmidi
snd_hda_codec 135168 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_via
snd_hda_codec_generic 77824 1 snd_hda_codec_via
snd_hda_codec_hdmi 53248 1
snd_hda_codec_via 20480 1
snd_hda_core 86016 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_via
snd_hda_intel 49152 4
snd_hwdep 20480 1 snd_hda_codec
snd_pcm 102400 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core
snd_rawmidi 36864 1 snd_seq_midi
snd_seq 69632 2 snd_seq_midi,snd_seq_midi_event
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_seq_midi 20480 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_timer 36864 2 snd_seq,snd_pcm
soundcore 16384 1 snd
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
ttm 102400 1 radeon
usbhid 53248 0
wmi 28672 1 wmi_bmof
wmi_bmof 16384 0
x_tables 40960 1 ip_tables
>> iwconfig
wlxd8eb97233e4d IEEE 802.11bgn ESSID:"Bbox-E1CFEDDE" Nickname:"rtl_wifi"
Mode:Managed Frequency:2.462 GHz Access Point: 34:6B:46:73:89:10
Bit Rate:72 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:****-****-****-****-****-****-****-**** Security mode:open
Power Management:off
Link Quality=74/100 Signal level=61/100 Noise level=0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
>> ifconfig -a
enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.69 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::fe46:8770:9c82:4f87 prefixlen 64 scopeid 0x20<link>
ether 90:e6:ba:cf:c5:54 txqueuelen 1000 (Ethernet)
RX packets 23814 bytes 15180048 (15.1 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 16247 bytes 2361741 (2.3 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Boucle locale)
RX packets 5162 bytes 501181 (501.1 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 5162 bytes 501181 (501.1 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlxd8eb97233e4d: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.7 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::4440:e0f6:3672:9eef prefixlen 64 scopeid 0x20<link>
ether d8:eb:97:23:3e:4d txqueuelen 1000 (Ethernet)
RX packets 6736 bytes 3226741 (3.2 MB)
RX errors 0 dropped 898 overruns 0 frame 0
TX packets 3761 bytes 518378 (518.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
>> sudo iwlist scan
wlxd8eb97233e4d Scan completed :
Cell 01 - Address: 34:6B:46:73:89:10
ESSID:"Bbox-E1CFEDDE"
Protocol:IEEE 802.11bgn
Mode:Master
Frequency:2.462 GHz (Channel 11)
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
12 Mb/s; 48 Mb/s
Extra:rsn_ie=30140100000fac040100000fac040100000fac020c00
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: DD800050F204104A0001101044000102103B0001031047001020F77378D9A156D68910752BA0AB24B91021000842726F6164636F6D1023000842726F6164636F6D1024000631323334353610420004313233341054000800060050F20400011011000A42726F6164636F6D415010080002200C103C0001011049000600372A000120
Signal level=100/100
>> uname -r -m
5.0.0-36-generic x86_64
>> cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
>> nm-tool
>> nmcli dev wifi
IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY
* Bbox-E1CFEDDE Infra 11 54 Mbit/s 79 ▂▄▆_ WPA2
>> nmcli connection list (< 15.04) ou nmcli connection show (>= 15.04)
NAME UUID TYPE DEVICE
Bbox-E1CFEDDE 1 c52c4b92-d1be-457d-9890-fe7c47530129 wifi wlxd8eb97233e4d
Connexion filaire 1 8c427ad9-0204-3cc0-aa46-b8464fddd023 ethernet enp2s0
Bbox-E1CFEDDE 783b6608-50be-4c30-a7eb-84ec1188cb0e wifi --
Bbox-E1CFEDDE-5GHz 6183e5e0-08f6-4c7c-96e2-3cad8902cfb0 wifi --
Bbox-Jef 61590c5a-785f-43be-aa3d-f449a83e7dc5 wifi --
>> nmcli connection status
>> sudo rfkill list
cordialement