On Fri 12 Mar 2021 at 21:14:34 (-0500), The Wanderer wrote: > On 2021-03-12 at 21:05, David wrote: > > > So I guess the answer is either in the kernel, or systemd, > > but I don't know, and I found no further clues about that in > > either the Arch Linux wiki [1] or the Debian Reference [2] > > or the Debian wiki [3]. > > > > So I will stay silent now and wait for someone who knows more > > to answer :) > > > > [1] https://wiki.archlinux.org/index.php/Network_manager > > [2] https://www.debian.org/doc/manuals/debian-reference/ch05.en.html > > [3] https://wiki.debian.org/NetworkConfiguration > > I wouldn't say that I particularly know more; in fact I may know less. > > However, if I were encountering such symptoms and had (as has apparently > happened here) searched the system for mention of the key term 'wwan' > without finding it, the next places I'd look for clues would be A: dmesg > and B: the contents of /var/log/. (If running systemd, I'd probably also > want to investigate the contents of the journal, but I don't know proper > syntax for that beyond the name 'journalctl'.) > > It might be necessary to make sure you're booting with appropriate > message verbosity; IIRC, systemd may default to a quieter boot than > sysvinit does, so you may have to adjust some grub parameters and > reboot. In principle, however, I'd expect that if such devices are being > set up at boot time there'd have to be some details about that logged > during the boot process, and such logging would have to go to one or > more of those three places.
I don't know what Debian or kernel the OP is running. Googling linux kernel wwan device throws up https://lore.kernel.org/netdev/20200225105149.59963c95aa29.Id0e40565452d0d5bb9ce5cc00b8755ec96db8559@changeid/ which suggests a mobilephone-type device. BTW /etc/udev/rules.d will only be populated if you put your own stuff there (like I do); it belongs to the sysadmin. The system uses /lib and /run. Cheers, David.
