ich habe Jessie neu aufgesetzt (Stretch auch, das gleiche Problem) und habe auf dem PC kein WLAN. Hier ein paar Daten
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root@holger:~# inxi -Fz
System: Host: holger Kernel: 3.16.0-4-686-pae i686 (32 bit) Desktop: Cinnamon 2.2.16
Distro: Debian GNU/Linux 8
Machine: Mobo: MEDIONPC model: MS-7708 v: 1.2 Bios: American Megatrends v: A7708MLN.105 date: 09/21/2010
CPU: Dual core Intel Core i3 550 (-HT-MCP-) cache: 4096 KB
Clock Speeds: 1: 1200 MHz 2: 1200 MHz 3: 2533 MHz 4: 3200 MHz
Graphics: Card: NVIDIA G86 [GeForce 8400 GS]
Display Server: X.org 1.16.4 driver: nvidia tty size: 127x24 Advanced Data: N/A for root
Audio: Card Intel 5 Series/3400 Series High Definition Audio driver: snd_hda_intel
Sound: Advanced Linux Sound Architecture v: k3.16.0-4-686-pae
Network: Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
IF: eth0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Card-2: IMC Networks Mediao 802.11n WLAN [Realtek RTL8191SU] driver: r8712u
IF: wlan0 state: down mac: <filter>
Drives: HDD Total Size: 2500.5GB (1.0% used) ID-1: /dev/sda model: WDC_WD15EARS size: 1500.3GB
ID-2: USB /dev/sdb model: 2105 size: 1000.2GB
Partition: ID-1: / size: 19G used: 4.6G (27%) fs: ext4 dev: /dev/sda1
ID-2: /home size: 1.4T used: 2.0G (1%) fs: ext4 dev: /dev/sda6
ID-3: swap-1 size: 8.00GB used: 0.00GB (0%) fs: swap dev: /dev/sda5
Sensors: System Temperatures: cpu: 28.0C mobo: N/A gpu: 41C
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 184 Uptime: 14:33 Memory: 815.0/8102.8MB Client: Shell (bash) inxi: 2.1.28
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root@holger:~# iwconfig
wlan0 unassociated Nickname:"rtl_wifi"
Mode:Managed Access Point: Not-Associated Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
lo no wireless extensions.
eth0 no wireless extensions.
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root@holger:~# lspci -nnk | grep -i net
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 06)
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systemctl restart network-manager
Hat jemand einen Tip?