[all variants] Asus T91MT Screen Error

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http://ubuntuforums.org – Hi Guys! I Have a little Asus T91MT running Ubuntu 12.04 and it has a screen error that makes the screen half itself but when i log out it is all normal and fine the whole screen is being used but when i log in it freezes the bottom half and the top half is trying to fit the whole screen into it but is very pixely if you know what i mean and just very hard to use. i have re-installed it a few time but it just keeps coming back to me and when it boots it is using the whole screen but the second it logs in it half's again. Any way I Really Need Some Help! (Hardware)