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Since some days I'm having the following issue. When system try to start X to run lightdm it fails, the displayed window says that the system seems unable to recognize all the devices, after that it ask me what I want to do. The funny part in all this is that if I log in tty, kill xinit and give the command

service lightdm start

it works: the it loads the login screen and after that I can work fine.

From the log in /var/log/Xorg.failsafe.log the only error seems to be

(EE) FBDEV(0): FBIOPUTCMAP: Invalid argument

The distro I'm using is an ubuntu 12.04 my graphic card is a ATI RV710.

Does anyone have idea on what the problem could be? And what does it mean the error in log above?

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