I tried rebuilding the Ubuntu way with CONFIG_NL80211_TESTMODE and CONFIG_IWLWIFI_DEVICE_SVTOOL turned off as this showed up in the config diff and seemed related enough, but it didn't help.
The I tried rebuilding the upstream way but I didn't manage to build a sensible mainline config that I could use straight away with my current initrd, so I guess I'll have to dig a bit more into this; the config I used was based of Ubuntu and transformed with localyesconfig to allow carrying a single zImage around, but that resulted in an OOPS on boot (strncpy in i2400m module).
I tried rebuilding the Ubuntu way with CONFIG_ NL80211_ TESTMODE and CONFIG_ IWLWIFI_ DEVICE_ SVTOOL turned off as this showed up in the config diff and seemed related enough, but it didn't help.
The I tried rebuilding the upstream way but I didn't manage to build a sensible mainline config that I could use straight away with my current initrd, so I guess I'll have to dig a bit more into this; the config I used was based of Ubuntu and transformed with localyesconfig to allow carrying a single zImage around, but that resulted in an OOPS on boot (strncpy in i2400m module).