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Issue solved with kernek 4.4
Tks to all

I can boot and login on 4.3 but black window overlay the 80% of the desktop so i'm able to do nothing ;-(

This is for 4.2 kernel:


# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n...

Thank for your suggest, but in last working kernel (4.2) no bug or issues are present in logs, and in last kernels 4.3.0-x
it's impossible to open a terminal because the huge black window that...

In kernel 4.3 is impossible to work more then login.
In kernel 4.2 no error were log, everything works fine

Ubuntu 16.04 LTS
kernel 4.3.x.xx
Acer Aspire 5610

Video memory corruption.
A black window partially cover the login area after boot. Change video memory size don't give effect to the issue....

Ubuntu 16.04 LTS
kernel 4.3.x.xx
Acer Aspire 5610

Video memory corruption.
A black window partially cover the login area after boot.
Work well until kernel 4.2.x.xx