I used mkusb following this page https://help.ubuntu.com/community/mkusb and (without pre-treating the vivid-desktop-amd64.iso with isohybrid) attempted another stick creation. And presto, it works!
Tried booting on both my laptops, the present new DELL XPS13 and an old thinkpad T60, and it booted on both. Then it gets strange. On the T60 the menu under the panel network icon showed the WIFI entry, but greyed out - could not be selected. With this laptop I had never an issue with WIFI, albeit limited to 2.4GHz. On the DELL, there was not even an entry for WIFI in the panel menu. Looked into "Additional Driver" and found the Broadcom STA listed, but inactiv. Activated, applied and there was the WIFI menu. I can connect to my lan! Still, no sign of my 2.4GHz signal from the same router as the 5GHz signal. I verified with my Nexus7 tablet, that both signals are present. Now it gets even stranger. On the panel network icon menu I see a signal from my neighbourhood on 2.4GHz. Again, verified with the Nexus that it is indeed on 2.4GHz. I can click on it on my DELL (but it needs a password, so here it ends). But my local 2.4GHz signal is better than -30dB, while the neighbour's is very weak at -90 dB and still seen by the DELL. I believe this is a million fold difference! I inactivated my router's 5GHz signal, so that it would only offer 2.4GHz - DELL now doesn't find anything (except still the neighbour's weak signal). I tried to manually create my 2.4 network - no luck. 'iwlist wlan0 freq' finds 14 channels 2.4GHz and another 18 of 5 GHz. But this may not mean anything? Is there anything to determine whatever the wl module sees on 2.4GHz? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to bcmwl in Ubuntu. https://bugs.launchpad.net/bugs/1456585 Title: 14e4:43b1 DELL XPS 13 (9343) Only wireless 5GHz works, but not 2.4GHz Status in Broadcom 802.11 Linux STA driver: New Status in bcmwl package in Ubuntu: Triaged Status in linux package in Ubuntu: Invalid Bug description: This laptop came factory preinstalled with Ubuntu 14.04, but it had and still has way too many problems. I have now kernel 3.16.0-37-generic running. The wireless driver is wl, installed from bcmwl-kernel-source. I have wireless working at 5GHz with good speed, everything well. However, I can't connect to wireless on 2.4GHz. Before I had kernel 3.13.0-52-generic, which had the same problem. I tried kernel 4.1.0-rc2 and rc3, but both failed on installing from bcmwl-kernel-source. Trying "iwlist wlan0 freq" I get a list of channels 1-14 at 2.4GHz, and 32-66 at 5GHz. Still, only the 5GHz works. Other devices in my house do connect well to the 2.4GHz (from a Fritzbox router). "iwlist wlan0 scan" has "no scan result" when 5GHz is disabled, and finds one network at 5.18GHz when enabled. Network controller [0280]: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03) Subsystem: Dell Device [1028:0019] --- ApportVersion: 2.14.1-0ubuntu3.10 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: ullix 1839 F.... pulseaudio /dev/snd/controlC0: ullix 1839 F.... pulseaudio CurrentDesktop: MATE DistributionChannelDescriptor: # This is a distribution channel descriptor # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-trusty-amd64-20140620-0 DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=7b6c248b-36d3-4dcf-9e9e-427d50206af6 InstallationDate: Installed on 2015-04-24 (25 days ago) InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20140620-04:25 MachineType: Dell Inc. XPS 13 9343 NonfreeKernelModules: wl Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-37-generic root=UUID=fda802ca-9257-4fed-bb0d-9f4756dca419 ro pcie_aspm=force radeon.modeset=0 plymouth:debug drm.debug=0xe nouveau.modeset=0 video.use_native_backlight=1 quiet splash pcie_aspm=force radeon.modeset=0 nouveau.modeset=0 video.use_native_backlight=1 "acpi_osi=Windows 2013" ProcVersionSignature: Ubuntu 3.16.0-37.51~14.04.1-generic 3.16.7-ckt9 RelatedPackageVersions: linux-restricted-modules-3.16.0-37-generic N/A linux-backports-modules-3.16.0-37-generic N/A linux-firmware 1.127.11 Tags: trusty Uname: Linux 3.16.0-37-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev sambashare scanner sudo tape video _MarkForUpload: True dmi.bios.date: 03/25/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A03 dmi.board.name: 0TM99H dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA03:bd03/25/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0TM99H:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: XPS 13 9343 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. 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