Black screen after upgrade to 12.04.1

Try the boot option:

nomodeset

May help

 nomodest helps and I can log in to Ubuntu but screen resolution got bad (600*800) and I couldn't change it in display settings. Any ideas? Thnx a lot.

What is the output of:

sudo lshw -C display; lsb_release -a; uname -a

Thanks

Wrong information: the resolution is 1024*768 (4:3). This is the output of previous command:

[sudo] password for omar:
  *-display:0 UNCLAIMED
       description: VGA compatible controller
       product: Mobile 4 Series Chipset Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list
       configuration: latency=0
       resources: memory:d0000000-d03fffff memory:c0000000-cfffffff ioport:4110(size=8)
  *-display:1 UNCLAIMED
       description: Display controller
       product: Mobile 4 Series Chipset Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2.1
       bus info: pci@0000:00:02.1
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: latency=0
       resources: memory:d3400000-d34fffff
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.1 LTS
Release: 12.04
Codename: precise
Linux omar-acer 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
omar@omar-acer:~$

You may need a /etc/X11/xorg.conf to make the OS load the driver for the device. You want to use the intel driver.

Sould I type in the terminal: /etc/X11/xorg.conf ?

no,

gksudo gedit /etc/X11/xorg.conf

You will need to use the web to find sample files.

Xorg.conf has appeared empty after executing this command.

The OS doesn't ship with one by default. Some graphics need it though and if you make one it will be obeyed,

I have the same problem.

Black screen when i reboot the machine. web say me to change

GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"

and fix the problem but the resolution was 1024x768 and the real resolution 1600x900

I read GMA 4500M has a bug on 12.04, the system show me

VESA: Intel(r)Cantiga Graphics

any idea?