# Wpa\_supplicant bgscan simple failed to enable signal strength monitoring

**URL:** <https://www.debian-fr.org/t/wpa-supplicant-bgscan-simple-failed-to-enable-signal-strength-monitoring/81321>\
**Category:** Support Debian\
**Created:** [Février 25, 2020, 6:34 UTC](https://www.debian-fr.org/t/wpa-supplicant-bgscan-simple-failed-to-enable-signal-strength-monitoring/81321 "2020-02-25T06:34:25Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![nestorburma](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/n/ecccb3/32.png) [@nestorburma](https://www.debian-fr.org/u/nestorburma)\
**Post date:** [Février 25, 2020, 6:34 UTC](https://www.debian-fr.org/t/wpa-supplicant-bgscan-simple-failed-to-enable-signal-strength-monitoring/81321/1 "2020-02-25T06:34:26Z")

</div>

bonjour  
quand je fais

```nohighlight
sudo journalctl -p err

```

j’ai cette réponse du terminal

```nohighlight
wpa_supplicant bgscan simple failed to enable signal strength monitoring

```

ça signifie quoi,à priori j’ai pas de probleme ,le wifi fonctionne ,quoique le signal est un peu faible pour mon goût

---

<div class="post-metadata">

**Author:** ![grandtoubab](https://www.debian-fr.org/user_avatar/www.debian-fr.org/grandtoubab/32/4505_2.png) [@grandtoubab](https://www.debian-fr.org/u/grandtoubab)\
**Post date:** [Février 25, 2020, 7:15 UTC](https://www.debian-fr.org/t/wpa-supplicant-bgscan-simple-failed-to-enable-signal-strength-monitoring/81321/2 "2020-02-25T07:15:34Z")

</div>

C’est une erreur probablement en relation avec le driver.  
Je l’ai aussi et ça ne m’inquiète pas

```auto
lspci -nnk | grep -i net -A2

```

**Exemple**

\*Subsystem: Hewlett-Packard Company BCM4313 802.11bgn Wireless Network Adapter [103c:1483]  
Kernel driver in use: wl  
_Kernel modules: bcma, wl_

pour le wifi ce qui est important

```auto
sudo iwconfig

```

**Exemple**

_wlo2  
Bit Rate=54 Mb/s Tx-Power=1 dBm  
Retry short limit:7 RTS thr:off Fragment thr:off  
Encryption key:off  
Power Management:off  
Link Quality=60/70 Signal level=-50 dBm  
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0  
Tx excessive retries:0 Invalid misc:0 Missed beacon:0_

on peut modifier le txpower et laisser en puissance max avec iwconfig uniquement si le driver le permet  
**Exemple**

_sudo /sbin/iwconfig wlo2 txpower auto_  
_sudo /sbin/iwconfig wlo2 power of_f

---

<div class="post-metadata">

**Author:** ![nestorburma](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/n/ecccb3/32.png) [@nestorburma](https://www.debian-fr.org/u/nestorburma)\
**Post date:** [Février 26, 2020, 5:16 UTC](https://www.debian-fr.org/t/wpa-supplicant-bgscan-simple-failed-to-enable-signal-strength-monitoring/81321/3 "2020-02-26T05:16:56Z")

</div>

re  
pour moi les differentes entrées du terminal donnent ça

```nohighlight
jean@jean:~$ lspci -nnk | grep -i net -A2
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 15)
	Subsystem: ASUSTeK Computer Inc. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1043:200f]
	Kernel driver in use: r8169
	Kernel modules: r8169
03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821]
	Subsystem: AzureWave RTL8821CE 802.11ac PCIe Wireless Network Adapter [1a3b:3040]
	Kernel driver in use: rtl8821ce
	Kernel modules: 8821ce
jean@jean:~$ 

```

```nohighlight
jean@jean:~$ sudo iwconfig
[sudo] Mot de passe de jean : 
lo no wireless extensions.

enp2s0 no wireless extensions.

wlp3s0 IEEE 802.11AC ESSID:"bboxsalon" Nickname:"<WIFI@REALTEK>"
          Mode:Managed Frequency:5.18 GHz Access Point: EC:BE:DD:A1:FC:04   
          Bit Rate:434 Mb/s Sensitivity:0/0  
          Retry:off RTS thr:off Fragment thr:off
          Encryption key: ****-**** - ****-**** - ****-**** - ****-**** Security mode:open
          Power Management:off
          Link Quality=63/100 Signal level=-71 dBm Noise level=0 dBm
          Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
          Tx excessive retries:0 Invalid misc:0 Missed beacon:0

jean@jean:~$ 

```

```nohighlight
jean@jean:~$ sudo /sbin/iwconfig wlo2 txpower auto
Error for wireless request "Set Tx Power" (8B26) :
    SET failed on device wlo2 ; No such device.
jean@jean:~$ 

```

```nohighlight
jean@jean:~$ sudo /sbin/iwconfig wlo2 power off
Error for wireless request "Set Power Management" (8B2C) :
    SET failed on device wlo2 ; No such device.
jean@jean:~$ 

```

mais ,à priori ça ne gène pas le fonctionnement du wifi donc je laisse comme ça

---

<div class="post-metadata">

**Author:** ![grandtoubab](https://www.debian-fr.org/user_avatar/www.debian-fr.org/grandtoubab/32/4505_2.png) [@grandtoubab](https://www.debian-fr.org/u/grandtoubab)\
**Post date:** [Février 26, 2020, 7:13 UTC](https://www.debian-fr.org/t/wpa-supplicant-bgscan-simple-failed-to-enable-signal-strength-monitoring/81321/4 "2020-02-26T07:13:09Z")

</div>

c’est pas faute d’avoir indiqué **Exemple**  
Pourquoi copier/coller des commandes sans les comprendre?

Mon interface wifi s’appelle wlo2, la tienne wlp3s0 …

---

<div class="post-metadata">

**Author:** ![nestorburma](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/n/ecccb3/32.png) [@nestorburma](https://www.debian-fr.org/u/nestorburma)\
**Post date:** [Février 28, 2020, 2:33 UTC](https://www.debian-fr.org/t/wpa-supplicant-bgscan-simple-failed-to-enable-signal-strength-monitoring/81321/5 "2020-02-28T14:33:23Z")

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bonjour grandtoubab  
voila la sortie du terminal avec la nouvelle interface

```nohighlight
jean@jean:~$ sudo /sbin/iwconfig wlp3s0 txpower auto
[sudo] Mot de passe de jean : 
Error for wireless request "Set Tx Power" (8B26) :
    SET failed on device wlp3s0 ; Operation not permitted.
jean@jean:~$ 

```

excuse moi d’avoir tarder à répondre mais j’étais en train d’essayer d’installer une archlinux sur mon autre partition

---

<div class="post-metadata">

**Author:** ![grandtoubab](https://www.debian-fr.org/user_avatar/www.debian-fr.org/grandtoubab/32/4505_2.png) [@grandtoubab](https://www.debian-fr.org/u/grandtoubab)\
**Post date:** [Février 28, 2020, 5:23 UTC](https://www.debian-fr.org/t/wpa-supplicant-bgscan-simple-failed-to-enable-signal-strength-monitoring/81321/6 "2020-02-28T17:23:05Z")

</div>

le pilote rtl8821ce n’autorise pas la modification

---

<div class="post-metadata">

**Author:** ![nestorburma](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/n/ecccb3/32.png) [@nestorburma](https://www.debian-fr.org/u/nestorburma)\
**Post date:** [Février 29, 2020, 4:56 UTC](https://www.debian-fr.org/t/wpa-supplicant-bgscan-simple-failed-to-enable-signal-strength-monitoring/81321/7 "2020-02-29T04:56:24Z")

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re  
tu as raison c’est le pilote qui ne permet pas ,le problème est le même avec archlinux,