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I have one of the new Dell XPS 15 laptops, model 9550. I've had it for a few months now and things were working fine until yesterday when my wifi card stopped working.
The wifi was working on Sunday morning. I did a suspend/resume cycle and the laptop froze on resume. After a reset the wifi doesn't work anymore. The wifi card is a broadcom BCM43602. It's really weird because I don't see any error messages on dmesg. No errors or anything suspicious. As far as the driver is concerned everything is good and working but the card does not do anything. To rule out a kernel/firmware issue I've gone back to previous versions and I have even booted with the Arch live image USB stick, the same one I used to install arch, and the wifi card behaves the same way. It worked fine when I installed arch.
I suspect the card is fried somehow and needs replacing. Do you guys know any tricks I could try to get a better diagnosis of the situation?
Let me give a little bit more info below:
The card is properly seen by linux:
$ lspci | grep -A 7 BCM43602
02:00.0 Network controller: Broadcom Corporation BCM43602 802.11ac Wireless LAN SoC (rev 01)
Subsystem: Dell Device 0024
Flags: bus master, fast devsel, latency 0, IRQ 142
Memory at dd800000 (64-bit, non-prefetchable) [size=32K]
Memory at dd400000 (64-bit, non-prefetchable) [size=4M]
Capabilities: <access denied>
Kernel driver in use: brcmfmac
Kernel modules: brcmfmac
It shows the proper interface:
$ ip addr show wlp2s0
3: wlp2s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
link/ether 48:e2:44:f5:7a:6b brd ff:ff:ff:ff:ff:ff
However, if I try to scan, nothing happens:
$ iw dev wlp2s0 scan
< nothing is printed and it never returns >
On dmesg I get:
[20117.015970] brcmfmac: brcmf_run_escan: error (-4)
[20117.015973] brcmfmac: brcmf_cfg80211_scan: scan error (-4)
These are the only error messages I see, and only appear when I try to do a scan.
Any ideas how to confirm that the card is fried?
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