@paradadf Thanks for it ! I've already returned the dongle to Amazon but if it may help someone it is always good !
Anyway I think recompiling a driver is a bit too advanced for me ^^
@gkralicek2 Searching out something else, I found an old USB wifi dongle (BELKIN N300 Micro Wireless Adapater) and it works like a charm !
@gkralicek2 Ok I take this one from amazon.
I'll get you in touch when I'll get it.
However thanks for the time past trying to solve the problem.
@gkralicek2 ... not better after reinstalling... I will try with another usb dongle, any advice about which one to get ?
Maybe should I try reinstalling from zero the last update of the recalbox OS, is there a possibility that It will solve the problem ?
@gkralicek2 Ok. I managed to isolate the part of the recalbox.log file that matches the boot with Ethernet, I think it is OK. Here is the part of the file :
[ 11.37] : starting new log
[ 11.41] : converting dos to unix carriage return characters
[ 12.18] : setting hostname to RECALBOX
[ 12.19] : setting audio volume to 90
[ 12.23] : setting audio to auto
---- recalbox-config.sh ----
[ 12.27] : setting audio volume : 90
---- recalbox-config.sh ----
[ 12.30] : setting audio output mode : auto
numid=3,iface=MIXER,name='PCM Playback Route'
; type=INTEGER,access=rw------,values=1,min=0,max=2,step=0
: values=0
Simple mixer control 'PCM',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback -10239 - 400
Mono: Playback -663 [90%] [-6.63dB] [on]
[ 12.44] : creating network entry in /var/lib/wpa_supplicant.conf
[ 12.49] : updated wifi settings : ssid=NUMERICABLE-B023 key=BNKFPLJB1K
[ 12.52] : setting keyboard layout to fr
Loading /usr/share/keymaps/i386/azerty/fr.map.gz
[ 13.13] : starting emulationstation with lang = fr_FR
[ 13.15] : Starting emulationstation with command :
[ 13.18] : HOME=/recalbox/share/system LANG="fr_FR.UTF-8" SDL_VIDEO_GL_DRIVER=/usr/lib/libGLESv2.so SDL_NOMOUSE=1 /usr/bin/emulationstation; [ -f /tmp/shutdown.please ] && (rm /tmp/shutdown.please; shutdown -h now);[ -f /tmp/reboot.please ] && (rm /tmp/reboot.please; shutdown -r now)
---- recalbox-config.sh ----
udhcpc (v1.24.1) started
Sending discover...
Sending discover...
Sending discover...
No lease, failing
---- recalbox-config.sh ----
[ 28.12] : no wlan interface found
[ 31.19] : Starting S94manager
Will not start pm2 : system.api.enabled is set to 0
---- recalbox-config.sh ----
@gkralicek2 Here it is :
[ 5271.69] : Stopping S94manager
[ 2.79] : starting new log
[ 2.82] : converting dos to unix carriage return characters
[ 3.52] : setting audio to auto
[ 3.60] : setting audio volume to 90
---- recalbox-config.sh ----
[ 3.65] : setting hostname to RECALBOX
---- recalbox-config.sh ----
[ 3.71] : setting audio output mode : auto
[ 3.73] : setting audio volume : 90
numid=3,iface=MIXER,name='PCM Playback Route'
; type=INTEGER,access=rw------,values=1,min=0,max=2,step=0
: values=0
Simple mixer control 'PCM',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback -10239 - 400
Mono: Playback -663 [90%] [-6.63dB] [on]
[ 3.84] : creating network entry in /var/lib/wpa_supplicant.conf
[ 3.89] : setting keyboard layout to fr
[ 3.89] : updated wifi settings : ssid=NUMERICABLE-B023 key=BNKFPLJB1K
Loading /usr/share/keymaps/i386/azerty/fr.map.gz
[ 4.55] : starting emulationstation with lang = fr_FR
[ 4.58] : Starting emulationstation with command :
[ 4.60] : HOME=/recalbox/share/system LANG="fr_FR.UTF-8" SDL_VIDEO_GL_DRIVER=/usr/lib/libGLESv2.so SDL_NOMOUSE=1 /usr/bin/emulationstation; [ -f /tmp/shutdown.please ] && (rm /tmp/shutdown.please; shutdown -h now);[ -f /tmp/reboot.please ] && (rm /tmp/reboot.please; shutdown -r now)
---- recalbox-config.sh ----
udhcpc (v1.24.1) started
Sending discover...
Sending discover...
Sending select for 192.168.0.27...
Lease of 192.168.0.27 obtained, lease time 86400
deleting routers
adding dns 89.2.0.1
adding dns 89.2.0.2
---- recalbox-config.sh ----
[ 15.85] : no wlan interface found
---- recalbox-config.sh ----
[ 18.87] : Starting S94manager
Will not start pm2 : system.api.enabled is set to 0
@gkralicek2 Then I get this output :
ip: SIOCGIFFLAGS: No such device
@gkralicek2 Ok so i do not have a wlan0 interface listed here is the outputof the ifconfig :
eth0 Link encap:Ethernet HWaddr B8:27:EB:87:12:3A
inet addr:192.168.0.27 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::ba27:ebff:fe87:123a%1994612484/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:104 errors:0 dropped:0 overruns:0 frame:0
TX packets:135 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:9948 (9.7 KiB) TX bytes:19315 (18.8 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1%1994612484/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
And this is the content of the /etc/network/interfaces file :
# Configure Loopback
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
auto wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
@gkralicek2
I use a 3A power supply, and I never had problems using other USB devices.
I just played for 15 minutes and never noticed any icon on the screen.
Just to be sure it doesn't come from the power supply, I tried another one, without success.
I noticed that the LED of the dongle flash for 1/10 second when I plug it.
@gkralicek2 I tried to unplugged the dongle and plug it into all the other port without sucess 
Besides,the AP SSID is visible.
Just to be sure that it don't come from the dongle itself, I plugged it on my Windows 10 PC and it works fine. But there is a LED on the dongle that flash when connected to the PC that do not flash when connected to the RPI...