This is duplicate. But the older questions were not answered. So, you can count that this a reminder question (if no answer, I will set bounty).
I have Ubuntu 15.04. Sometimes, when I open the laptop and log-in, the display is filled with black screen. But everything is running (I can even enter to the tty by CtrlAltF1 (tty mode is displayed) and exit), only the display is not working. So, I need to reboot. After reboot, the system works normally.
I need cause of this problem alongside answer. So, please do not hesitate to write detailed. Any help will be much appreciated.
My tries: updated NVIDIA drivers, used Nouveau display drivers. And I concluded that this not driver fault.
1st Update: I use
2nd Update: I installed deb file from the link and this is the output from
Traceback (most recent call last): File "/usr/bin/unity-reset", line 67, in <module> subprocess.call("unity") File "/usr/lib/python2.7/subprocess.py", line 522, in call return Popen(*popenargs, **kwargs).wait() File "/usr/lib/python2.7/subprocess.py", line 710, in __init__ errread, errwrite) File "/usr/lib/python2.7/subprocess.py", line 1335, in _execute_child raise child_exception OSError: [Errno 2] No such file or directory
I think full download is needed... I will try to download it in 1-2 days then update the results.
3rd Update: Reinstalling
lightdm-gtk-greeter did not work. I get black screen after second close-open...
$ find /usr/sbin/ -name "*dm" /usr/sbin/lightdm $ ps ax | grep dm 846 ? SLsl 0:00 /usr/sbin/lightdm 853 tty7 Ssl+ 1:57 /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch 1032 ? Sl 0:00 lightdm --session-child 12 19 2347 pts/1 S+ 0:00 grep --color=auto dm
5th Update: I have noticed that when I close laptop, it sometimes suspends unusually longer and only after that this problem occurs.