After upgrading to 13.10 from 13.04 the notebook screen is deadly black as the X server starts; the only workaround I found is to start with an external monitor connected. Doing this way I can login in and once I set the mirroring desktop I can normally operate on the external monitor.

The strange thing is that if I use xrandr to set the brightness to the maximum on LVDS I can see a little bit the images on the screen: but just a really little bit!!

I guess it's related to the AMD-driver catalyst version 13.20.16 beta 1 (fglrx), the only I can use with the new kernerl 3.11.
(I tried even with other version of fglrx: the last stable on the amd-site, and the one provided in ubuntu-repository; but nothing changes)

My graphic adapter is an ATI Mobility Radeon 5XXX
and if I try to not use ATI proprietary driver I can see correctly both screens but the system become very slow and all the interface is unstable (compiz doesn't load, cairo-dock doesnt' start, and so on...)

Please let me know what kind of more depth infos I could provide: I cannot find how to attach some file/log to this post...

Thanks in advance for your piece of advices!