On 06/10/2017 08:04 AM, Yann Cohen wrote:
Hello,
[snip]
Please appologize my poor English.
Your English is fine. The less said about my French, the better.
Last week, I reinstalled my laptop (lenovo YOGA 13) with Debian Stretch and network-manager. Linux yogayan 4.9.0-3-amd64 #1 SMP Debian 4.9.30-1 (2017-06-04) x86_64 GNU/Linux Bus 001 Device 004: ID 0bda:1724 Realtek Semiconductor Corp. RTL8723AU 802.11n WLAN Adapter
That is likely your problem. See thread beginning at <https://lists.debian.org/debian-user/2017/04/msg00525.html>. Cindy-Sue Causey pointed to <https://packages.debian.org/jessie/firmware-realtek> See also comment by Pascal Hambourg at <https://lists.debian.org/debian-user/2017/04/msg00552.html> HTH