kmb42vt wrote:Has anyone seen a problem with the login screen appearing for a second and then going to a blank screen during a normal boot/reboot? I'm getting this on a random but frequent basis. I end up having to Ctrl+Alt+F1 to a prompt, login and then running...
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sudo service mdm restart
...in order to get back to the login screen. In short, MDM keeps crashing on me during a boot or reboot and I have to restart it. I haven't found anything in the logs yet but I'm still looking. Here's my system specs:
Intel Core2 Quad, 8.0 GB DDR2, 1.0 TB HDD, Nvidia GT 430 w/1.0 GB DDR3 (running Nvida 295 driver)
Never had a problem with LightDM or GDM in the past. Not sure if this is a kernel problem or just a matter of timing.
After further research it appears to be a problem with the current Nvidia driver (295.40) which apparently has more bugs than usual which have been causing power and performance regressions for many users and this is the driver version that the "Additional Drivers" app installs by default (the "Recommended" driver).
Without getting into too much detail, the solution that worked for me is to install the "(post-release updates) (version current-updates)" driver instead (295.49). So far, this has solved the problem with MDM disappearing on boot/reboot and dropped my overall memory usage by approximately 50 MB.
Update: After a couple of reboots, the problem with MDM and the available Nvidia drivers has returned and it appears I'm not the only one with MDM having a conflict with these drivers. I still don't know whether this is a problem with MDM, the kernel or the Nvidia drivers.