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So today I ran into a problem where my Wifi card wasn't working. It showed up in `lspci` but it did not show up as a network interface in `ip a`. It turns out I had to update the driver, but I couldn't figure out how to do it in Arch so I did it in Windows (Dual booted). My question is, how do I update the driver in Arch?
Here are some details about my card:
3a:00.0 Network controller [0280]: Broadcom Limited BCM4350 802.11ac Wireless Network Adapter [14e4:43a3] (rev 08)
Subsystem: Dell BCM4350 802.11ac Wireless Network Adapter [1028:0021]
Flags: bus master, fast devsel, latency 0, IRQ 133
Memory at dc400000 (64-bit, non-prefetchable) [size=32K]
Memory at dc000000 (64-bit, non-prefetchable) [size=4M]
Capabilities: [48] Power Management version 3
Capabilities: [58] MSI: Enable+ Count=1/16 Maskable- 64bit+
Capabilities: [68] Vendor Specific Information: Len=44 <?>
Capabilities: [ac] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [13c] Device Serial Number 00-00-cb-ff-ff-e9-30-52
Capabilities: [150] Power Budgeting <?>
Capabilities: [160] Virtual Channel
Capabilities: [1b0] Latency Tolerance Reporting
Capabilities: [220] #15
Capabilities: [240] L1 PM Substates
Kernel driver in use: brcmfmac
Kernel modules: brcmfmacOffline
How did you gather that updating the driver should fix the issue?
The driver you're using is in linux kernel, so if you're running the latest kernel, you also have the latest brcmfmac module.
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I have a dual-booted XPS 9350. Yesterday everything was working perfectly. After I woke up this morning, I attempted to boot into Windows. However it gave me the blue screen of death so I had to run automated repairs. After running automated repairs, I booted back into Arch and the Wifi interface no longer works. It did not show up when I ran `ip a` However the Broadcom Wireless Network Adapater did show up when I ran `lspci` as shown in the original post. I did many Google searches, but most often the issue is that the the Broadcom Wireless Network Adapter doesn't show up at all. So desperate me rebooted into the now half-working Windows, and I realised the Wifi didn't work too, as the drivers were not updated (so did many other things). My guess is the automated repair deleted many of them. I updated the drivers for all the devices and then Wifi started working again. Feeling hopeful I booted back into Arch and lo and behold the Wifi was back.
This leads me to think that updating the drivers in Windows somehow got the Wifi working again in my Arch.
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