wifi disabled in kernel 4.15

[monkeybrain20122]

Wifi stops working after kernel upgraded to 4.15

$uname -r
4.15.0-10-generic
$sudo lshw -C network
[sudo] password for monkeybrain: 
  *-network DISABLED        
       description: Wireless interface
       product: BCM4313 802.11bgn Wireless Network Adapter
       vendor: Broadcom Limited
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0b1
       version: 01
       serial: 68:a3:c4:2f:07:b0
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=brcmsmac driverversion=4.15.0-10-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11
       resources: irq:17 memory:f5500000-f5503fff

But it works if boot into kernel 4.13

$ uname -r
4.13.0-25-generic
$ sudo lshw -C network
[sudo] password for monkeybrain: 
  *-network                 
       description: Wireless interface
       product: BCM4313 802.11bgn Wireless Network Adapter
       vendor: Broadcom Limited
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0b1
       version: 01
       serial: 68:a3:c4:2f:07:b0
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=brcmsmac driverversion=4.13.0-25-generic firmware=610.812 ip=192.168.1.2 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:17 memory:f5500000-f5503fff

Seems that some firmware is missing.

[kerry_s]

firmware=N/A on 4.15

have you tried enabling it in hardware drivers?

[monkeybrain20122]

firmware=N/A on 4.15

have you tried enabling it in hardware drivers?

There is nothing to enable, this card always works out of the box, until 4.15.

[kerry_s]

i thought there was like a broadcom-wl, proprietary drivers also available besides the 1 in kernel.

sorry, its been years last dealing with broadcom wifi. it was always a issue on my older laptop that died a few years ago.

[monkeybrain20122]

i thought there was like a broadcom-wl, proprietary drivers also available besides the 1 in kernel.

sorry, its been years last dealing with broadcom wifi. it was always a issue on my older laptop that died a few years ago.

yeah some broadcom cards require downloading a kernel module but not this one. It works out of the box in 4.13, from which I made the post above, I didn't install anything.

[mc4man]

maybe
https://bbs.archlinux.org/viewtopic.php?id=234122

[jeremy31]

I think it might be something else, see the wireless script link in my signature and post results

[Cavsfan]

Would your network card use this driver?

[cavsfan@Le-Beast ~]$ inxi -Fnn
...
Network:   Card: Realtek RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller driver: r8169
           IF: eth0 state: up speed: 100 Mbps duplex: full mac: 00:24:21:51:21:3a

[monkeybrain20122]

maybe
https://bbs.archlinux.org/viewtopic.php?id=234122

You are right!

Following your link, I found the patched kernel source here , I compiled and installed it and wifi works.
It is rc9 since they could not merge it to the released branch on time.

$ uname -r
4.15.0-rc9-custom
$ lshw -C network
WARNING: you should run this program as super-user.
  *-network                
       description: Wireless interface
       product: BCM4313 802.11bgn Wireless Network Adapter
       vendor: Broadcom Limited
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0b1
       version: 01
       serial: 68:a3:c4:2f:07:b0
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=brcmsmac driverversion=4.15.0-rc9-custom firmware=610.812 ip=192.168.1.2 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:17 memory:f5500000-f5503fff

To test a bit more I tested kernel 4.16.0-041600rc2 from mainline kernel ppa, wifi card not detected. But it works in 4.16.0-rc4 from the branch above (again compiled from source)

$uname -r
4.16.0-rc4-custom
$ lshw -C network
WARNING: you should run this program as super-user.
  *-network                 
       description: Wireless interface
       product: BCM4313 802.11bgn Wireless Network Adapter
       vendor: Broadcom Limited
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0b1
       version: 01
       serial: 68:a3:c4:2f:07:b0
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=brcmsmac driverversion=4.16.0-rc4-custom firmware=610.812 ip=192.168.1.2 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:17 memory:f5500000-f5503fff

Thanks everyone for helping.

[mc4man]

ot. - one thing i've noticed on 18.04 is it compiles significantly faster than previous ubuntu, typically 5-6x faster.
For ex. on same laptop ffmpeg takes 10 -12 min. before while on 18.04 a bit more than 2 min.