Broadcom internal WiFi device not recognised

[dbclin2]

I've got an Acer One 10 (S1003 D16H1) 2in1 notebook/tablet with an Intel Atom X5-Z8350 running Ubuntu 19.10 - actually, to be more precise, I initially installed Lubuntu but then installed ubuntu-gnome-desktop and switched from Wayland to X.Org. Gnome handles the tablet features nicely: orientation and touchscreen work beautifully. When running under Windows the WiFi worked fine.
Here's my release:

$ uname -a
Linux tablet 5.3.0-40-generic #32-Ubuntu SMP Fri Jan 31 20:24:34 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

The only show stopper is the integrated WiFi. According to Acer documentation, it's got Broadcom version 1.596.10.0. But lspci doesn't recognise any networking device beyond the USB ethernet I've got plugged in and, naturally, ip a doesn't show me any wireless interface. dmesg doesn't add anything helpful.
I ran:

modprobe wl

and lsmod gives me this:

wl                   6455296  0
cfg80211              712704  1 wl

I also added the brcmfmac43430a0-sdio.txt driver to /lib/firmware/brcm/
There's been no sign of my WiFi device so far. Any ideas?

[chili555]

Please run and post:

lspci -nnk | grep 0280 -A3
dmesg | grep -i sdio

Thanks.

[dbclin2]

Thanks. Here's my output:

$ lspci -nnk | grep 0280 -A3
$ dmesg | grep -i sdio
[    3.071968] mmc1: new high speed SDIO card at address 0001

[chili555]

No clues so far. Let’s see:

lsusb

[dbclin2]

$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
Bus 001 Device 004: ID 0b05:1784 ASUSTek Computer, Inc. USB-N13 802.11n Network Adapter (rev. A1) [Ralink RT3072]
Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 002: ID 06cb:73f5 Synaptics, Inc. ITE Device(8910)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The ASUStek 802.11n is a USB WiFi device I've got plugged in through that 4-port hub. I could leave there, but (1) it doesn't make for a particularly "tablet" experience having to drag that thing along and, (2) the only full USB port is on the keyboard/base, so I'd lose my connection when I took the tablet part off.

[chili555]

Sorry, we still don't see anything resembling a wireless device. If you reboot into Winows, are there any details you can gather? Please post everything you can find, even if it seems trivial.

[CelticWarrior]

@chili555

AFAIK the WiFi in this lind of devices is usually in the SDIO bus. Not sure this helps but it's the only thing I can think of.

[chili555]

@chili555

AFAIK the WiFi in this lind of devices is usually in the SDIO bus. Not sure this helps but it's the only thing I can think of.

Hence my request for dmesg | grep -i sdio. Too bad the result was uninformative. Why do I have to work so hard on a Sunday afternoon??

[praseodym]

Please show

cat /sys/bus/sdio/devices/*
cat /sys/bus/sdio/devices/*/uevent

[dbclin2]

Well I certainly appreciate your attention on this Sunday afternoon! Especially since my wife tells me it's absolutely beautiful spring weather here in Toronto. I wouldn't know, myself - I've been in my office all day.
Unfortunately, the Windows options on the GRUB menu doesn't load. It's possible I messed up the Windows partitions while I was struggling to get Lubuntu installed. No great loss, but I won't be able to sneak back in to see how Windows recognises the Broadcom.
On the other hand, I was looking through the tablet's manual and it reminded me about the Fn+F3 hotkey to toggle airplane mode. Perhaps I'd triggered that and shut down the WiFi chip. I tried that a few times but it doesn't seem to have any impact.
Thanks!