Thank you @frankbell for your answer!
I've got it working now for those interested:
- debian 9 doesn't support per default Broadcom brcm4356
- having installed a new debian 9 on Lenovo L460 there is no folder
- DO NOT download firmware-brcm80211_20161130-4~deb8u1_all.deb (this one is buggy, that was my mistake that I've tried using it)
- Download firmware-brcm80211_20180825+dfsg-1_all.deb
https://packages.debian.org/en/sid/a...80211/download
- Install it
Code:
sudo dpkg -i firmware-brcm80211_20180825+dfsg-1_all.deb
- Now you have:
Code:
brcmfmac4356-pci.bin
and
Code:
brcmfmac4356-sdio.bin
in
- Download the missing file
Code:
https://chromium.googlesource.com/chromiumos/third_party/linux-firmware/+/master/brcm/brcmfmac4356-pcie.txt
to
(I have no idea why they are not putting the text file into the debian package in the first place, because without it the kernel module cannot be loaded/used.)
- Unload kernel module
Code:
sudo modprobe -r brcmfmac
- Load kernel module
Code:
sudo modprobe brcmfmac
- Check with
that loading the module has been successful
=> after this, I got the Wifi in the Network Manager and now I am able to use the Wifi if I install debian-9 directly on the machine. Unfortunately, I am using Qubes and there I don't get it working, but for that I will try to contact people in the qubes forum.