Public bug reported:
My Inspiron 6400 laptop has a Dell Wireless 1500 Draft 802.11n WLAN
Mini-Card with BCM4321 chip. I was using airmon-ng from aircrack-ng to
enter monitor mode. It claims the chipset is "non-mac80211 device?
(report this!)" but I think that's incorrect information and only
cosmetic. It does create the monitor device. Then I was using Wireshark
to capture packets from that device. I was only getting beacon, probe
request and probe response packets, despite knowing that there was data
on the network.
As a workaround, it is possible to properly monitor by using a different
driver, from the broadcom-sta-dkms package. After installing that
package and rebooting, I couldn't connect to my wireless network
anymore, but I could "echo 1 | sudo tee /proc/brcm_monitor0" to create a
prism0 device. Changing channels was a problem, maybe requiring a change
on the associated non-monitor device before enabling the monitor. But
capture on prism0 worked great. I was getting all kinds of packets and
was able to decrypt data in Wireshark after enabling "Assume packets
have FCS". Even though I couldn't connect to my network, I could capture
and decrypt its traffic. Rebooting seems required for switching from b43
to wl drivers, because otherwise the wl driver doesn't start properly.
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-26-generic 5.3.0-26.28
ProcVersionSignature: Ubuntu 5.3.0-26.28-generic 5.3.13
Uname: Linux 5.3.0-26-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k5.3.0-26-generic.
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC9200 Analog [STAC9200 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: bgjenero 1492 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xefffc000 irq 27'
Mixer name : 'SigmaTel STAC9200'
Components : 'HDA:83847690,102801bd,00102201
HDA:14f12bfa,14f100c3,00090000'
Controls : 22
Simple ctrls : 9
CurrentDesktop: XFCE
Date: Mon Jan 27 00:09:29 2020
HibernationDevice: RESUME=UUID=62d89c78-536c-42ab-968d-463122f8c3a2
InstallationDate: Installed on 2012-01-19 (2930 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Dell Inc. MM061
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-26-generic
root=UUID=d590f141-7b8d-421d-84b3-baa43181a241 ro resume=/dev/sda6
RelatedPackageVersions:
linux-restricted-modules-5.3.0-26-generic N/A
linux-backports-modules-5.3.0-26-generic N/A
linux-firmware 1.183.3
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to eoan on 2019-10-25 (94 days ago)
dmi.bios.date: 06/13/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A17
dmi.board.name: 0XD720
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA17:bd06/13/2007:svnDellInc.:pnMM061:pvr:rvnDellInc.:rn0XD720:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: MM061
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug eoan
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https://bugs.launchpad.net/bugs/1860954
Title:
b43 WiFi monitor mode doesn't work with BCM4321 card
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