Hi Manuel, On Tue, Jun 15, 2021 at 8:25 AM Manuel Wagesreither <ManWag@xxxxxxxxxxx> wrote: > > Hello all, > > I'm working on a project which is using wpa_supplicant 2.9 with NetworkManager 1.22.10 on a NVIDIA Jetson TX2 system-on-module using a CYW4354=BCM4354. The GNU/Linux distribution is a custom one created with Yocto; the kernel used is 4.9.140-l4t-r32.4+g3924d6fccfbf provided by NVIDIA. > I expect you aren't going to get a lot of help here. You're asking about a 5+ year old vendor kernel with a Broadcom vendor driver, ie not fully open source and upstream stuff. And you're asking about largely driver oriented stuff on the hostapd list. Granted, a lot of the same people are on multiple lists, so you'll hit a subset of the linux-wireless folk too. Since your stuff is provided by NVIDIA, I'd suggest asking them for support. > I observed the following behaviour: > 1. The error message `Failed to enable signal strength monitoring` shows up in our logs. It's not necessarily an error message. Do you need to enable "signal strength monitoring"? The drivers often output lots of information, you still need to evaluate if you actually care. I'm guessing everything works fine and you don't care. > 2. When roaming to a access point with a similar SSID, roaming works. (WebRTC video stream stutters but doesn't break.) > 3. When roaming to an access point with a different SSID, the "Dongle Host Driver" (which is a kernel module I guess?) restarts. Typically switching to a different SSID is not considered "roaming." And thus would typically have a more intense change. Indeed, if you look at your kernel log above your marked point, it's clear that the stack is being fully torn down and it looks like the WiFi chip's bus is being powered down, which usually results in an unload of the driver. And then powered back up reloads the driver which reloads the firmware. DHD or "Dongle Host Driver" is the Broadcom proprietary vendor driver for their WiFi chips. I hope that helps you understand at least a little bit. - Steve _______________________________________________ Hostap mailing list Hostap@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/hostap
