On Sunday, 10 April 2022 12:12:43 BST Michael wrote: > On Sunday, 10 April 2022 10:26:09 BST Neil Bothwick wrote: > > On Sun, 10 Apr 2022 10:18:29 +0100, Michael wrote: > > > > The PC is a laptop, which is usually connected to ethernet. Following > > > > Neil's prompt I just started it, without an ethernet cable connected, > > > > to check what Xorg log shows . . . O_O > > > > > > > > Well, what do you know! SDDM started properly, with mouse, GUI and > > > > all. No pam_unix problem. I am now even more confused than before. > > > > Why would the presence of an ethernet connection determine if SDDM > > > > starts and then exits, or not? :-/ > > > > > > This behaviour is repeatable. Why would the presence of a network > > > connection on this PC affect SDDM?! > > > > When you don't have the cable, are you using wireless or no network? Have > > you tried waiting a few minutes to see if SDDM comes up? I wonder if this > > could be a DNS or IPv6 issue? Remember the old saying "The problem is > > always DNS. Even when it's not DNS, it is DNS". > > Thank you Neil for prompting my brain to work in a different direction. :-) > > (As it happens I've experienced some DNSSEC issues on a router following a > buggy firmware update, but this would be seriously O/T for this M/L.) > > I have waited for minutes to see if SDDM will eventually kick in. It seems > the pam_unix intervention is terminal. SDDM does not start once session c1 > . > > The laptop has an ethernet NIC on the MoBo, which is gimped at 100Mbps. > This is not used under normal circumstances. Instead I use a USB 3.0 1Gbps > ethernet adaptor. Following your prompts I unplugged the USB ethernet > adaptor, connected the ethernet cable to the NIC on the MoBo and rebooted. > No problem. SDDM launches as it should. > > So this could be udev related? While udev isrobing the USB adaptor and > starting the dhcp negotiation, somehow this sequence interferes with the > SSDM starting up?
I replaced the USB ethernet adaptor with a USB wireless adaptor, plugged into the same port. Rebooted and SDDM starts normally. So, this problem only occurs when I have the wired USB adaptor plugged in. What could be a possible cause?
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