Hi Kai, If I use GDM, I can see display blinking aggressively. And for LightDM the service itself not starting getting below error
lightdm:1284): CRITICAL **: x_server_local_get_authority_file_path: assertion 'server != NULL' failed update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf lightdm[1484]: message repeated 3 times: [ /etc/modprobe.d is not a file] Even I reinstalled lightdm packages and rebooted, still no luck. As a workaround for now, I use acpi=off in grub to make machine back to graphical mode. But in this case also, if I reboot the machine hangs somewhere else, then hard reset is required. @Kai do you need any specific logs or any command output for your investigation? Thanks Jay -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1818816 Title: Ubuntu 16.04 LTS + "lspci: Cannot open /sys/bus No such file" on Dell 5820 Tower To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1818816/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
