I've had this happen on two older notebooks recently that were running 
Fedora 21 just fine. Did an update on one using fedup to 22, and process 
went thru with no issues, and the login screen would come up, but after 
entering the password, the screen would go blank except for the mouse 
pointer that would move around, but nothing else. Couldn't even get a 
terminal window (Ctrl-Alt-F?) at that point.  Was able to hard reboot, and 
without attempting to login, was able to get a terminal window to open. Tried 
a number of things, but the final thing that seemed to make it work was 
diabling gdm.server after downloading lightdm and making it the active 
service. But since I had done a number of things, wasn't 100% sure that was 
it.

Just did the update on another older notebook on Saturday, and got the 
same black screen and no response after trying to login. Did just the hard 
reboot, and opened a terminal window. Installed lightdm, and did the switch 
to lightdm instead of gdm, and rebooted the system, and again the screen 
Fedora 22 came up normall. 

Don't know why there was no issue with Fedora 21, but 22 had this problem. 

+----------------------------------------------------------+
  Michael D. Setzer II -  Computer Science Instructor      
  Guam Community College  Computer Center                  
  mailto:mi...@kuentos.guam.net                            
  mailto:msetze...@gmail.com
  http://www.guam.net/home/mikes
  Guam - Where America's Day Begins                        
  G4L Disk Imaging Project maintainer 
  http://sourceforge.net/projects/g4l/
+----------------------------------------------------------+

http://setiathome.berkeley.edu (Original)
Number of Seti Units Returned:  19,471
Processing time:  32 years, 290 days, 12 hours, 58 minutes
(Total Hours: 287,489)

BOINC@HOME CREDITS
ROSETTA     37928275.569204   |   SETI        69489762.108058
ABC         16613838.513356   |   EINSTEIN    81140058.876695

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