I'm actually getting good results using the updated brcmfmac43455 firmware files which Raspbian is using. To use them I first removed '/lib/firmware/brcm/brcmfmac43455-sdio.raspberrypi*' then put the brcmfmac43455-sdio* files in the same directory and rebooted.
ubuntu@ubuntu:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.4 LTS"
ubuntu@ubuntu:~$ ip address show wlan0
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether dc:a6:32:37:37:08 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.111/24 brd 192.168.1.255 scope global dynamic wlan0
valid_lft 85747sec preferred_lft 85747sec
inet6 fe80::dea6:32ff:fe37:3708/64 scope link
valid_lft forever preferred_lft forever
ubuntu@ubuntu:~$ md5sum /lib/firmware/brcm/brcmfmac43455-sdio.*
963eb0d4903040974ee88b4f85cb1f4f /lib/firmware/brcm/brcmfmac43455-sdio.bin
c5aeca0e33de4ae870986c517963fef7 /lib/firmware/brcm/brcmfmac43455-sdio.clm_blob
7b983812a8aee7bf701460436c686226 /lib/firmware/brcm/brcmfmac43455-sdio.txt
ubuntu@ubuntu:~$ dmesg | grep brcmfmac
[ 12.265990] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 12.271828] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[ 12.284536] usbcore: registered new interface driver brcmfmac
[ 12.355127] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.txt failed with error -2
[ 12.548549] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[ 12.579186] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Feb 27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
[ 13.578117] brcmfmac: power management disabled
ubuntu@ubuntu:~$ iw dev
phy#0 Unnamed/non-netdev interface wdev 0x2 addr 52:4f:c2:5b:63:7a type P2P-device txpower 31.00 dBm
Interface wlan0 ifindex 3 wdev 0x1 addr dc:a6:32:37:37:08 ssid Linksys01146_5GHz type managed channel 44 (5220 MHz), width: 80 MHz, center1: 5210 MHz txpower 31.00 dBm
For the record I'm connecting to a Linksys EA7450 wireless access point and I've restricted the 5GHz frequency to 802.11ac only.
I'm actually getting good results using the updated brcmfmac43455 firmware files which Raspbian is using. To use them I first removed '/lib/firmware/ brcm/brcmfmac43 455-sdio. raspberrypi* ' then put the brcmfmac43455-sdio* files in the same directory and rebooted.
ubuntu@ubuntu:~$ cat /etc/lsb-release RELEASE= 18.04 CODENAME= bionic DESCRIPTION= "Ubuntu 18.04.4 LTS" MULTICAST, UP,LOWER_ UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 32ff:fe37: 3708/64 scope link brcm/brcmfmac43 455-sdio. * 74ee88b4f85cb1f 4f /lib/firmware/ brcm/brcmfmac43 455-sdio. bin 870986c517963fe f7 /lib/firmware/ brcm/brcmfmac43 455-sdio. clm_blob f701460436c6862 26 /lib/firmware/ brcm/brcmfmac43 455-sdio. txt 0x15264345 alloc_request: using brcm/brcmfmac43 455-sdio for chip BCM4345/6 455-sdio. raspberrypi, 4-model- b.txt failed with error -2 alloc_request: using brcm/brcmfmac43 455-sdio for chip BCM4345/6 preinit_ dcmds: Firmware: BCM4345/6 wl0: Feb 27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
Unnamed/ non-netdev interface
wdev 0x2
addr 52:4f:c2:5b:63:7a
type P2P-device
txpower 31.00 dBm
ifindex 3
wdev 0x1
addr dc:a6:32:37:37:08
ssid Linksys01146_5GHz
type managed
channel 44 (5220 MHz), width: 80 MHz, center1: 5210 MHz
txpower 31.00 dBm
DISTRIB_ID=Ubuntu
DISTRIB_
DISTRIB_
DISTRIB_
ubuntu@ubuntu:~$ ip address show wlan0
3: wlan0: <BROADCAST,
link/ether dc:a6:32:37:37:08 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.111/24 brd 192.168.1.255 scope global dynamic wlan0
valid_lft 85747sec preferred_lft 85747sec
inet6 fe80::dea6:
valid_lft forever preferred_lft forever
ubuntu@ubuntu:~$ md5sum /lib/firmware/
963eb0d49030409
c5aeca0e33de4ae
7b983812a8aee7b
ubuntu@ubuntu:~$ dmesg | grep brcmfmac
[ 12.265990] brcmfmac: F1 signature read @0x18000000=
[ 12.271828] brcmfmac: brcmf_fw_
[ 12.284536] usbcore: registered new interface driver brcmfmac
[ 12.355127] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43
[ 12.548549] brcmfmac: brcmf_fw_
[ 12.579186] brcmfmac: brcmf_c_
[ 13.578117] brcmfmac: power management disabled
ubuntu@ubuntu:~$ iw dev
phy#0
Interface wlan0
For the record I'm connecting to a Linksys EA7450 wireless access point and I've restricted the 5GHz frequency to 802.11ac only.