half screen problem

Asked by giulia

i've just installed ubuntu 12.04 on my acer aspire one.
every time i turn it on, it displays everything on the top half of the screen with the lower one staying purple.
i've learned a way to temporarily solve the problem, which is to press Ctrl Alt F2 and then tipe sudo service lightdm restart, which solves the problem as long as i am using the computer-.
how can i fix it permanently,whithout having to do this everytime i turn the pc on?

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Ubuntu xserver-xorg-video-intel Edit question
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actionparsnip (andrew-woodhead666) said :

What is the output of:

sudo lshw -C display; lsb_release -a; uname -a; sudo dmidecode -t 1


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giulia (giulia-sinnl) said :

:~$ sudo lshw -C display
       description: VGA compatible controller
       product: System Controller Hub (SCH Poulsbo) Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 07
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi vga_controller bus_master cap_list rom
       configuration: driver=gma500 latency=0
       resources: irq:16 memory:b0080000-b00fffff ioport:1800(size=8) memory:c0000000-cfffffff memory:b0000000-b003ffff

:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.1 LTS
Release: 12.04
Codename: precise

:~$ sudo dmidecode -t 1
# dmidecode 2.11
SMBIOS 2.5 present.

Handle 0x0001, DMI type 1, 27 bytes
System Information
 Manufacturer: Acer
 Product Name: AO751h
 Version: Not Applicable
 Serial Number: LUS810B199919084172500
 UUID: 409CE0D5-6234-DE11-B190-00238BB90237
 Wake-up Type: Power Switch
 SKU Number: Not Specified
 Family: Not Specified

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Best actionparsnip (andrew-woodhead666) said :


May help, in future please run commands as one if they are given as one.

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giulia (giulia-sinnl) said :

Thanks actionparsnip, that solved my question.