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I have problem in my toshiba l500 when I work on ubuntu , first when I had ubuntu 10.04 , the shipset works all the time , then I resolved it was problems in graphical driver , now when I upgrade to 12.10 the same problem come again I repaired with other driver but at the last update the problem is back .what is the main raison for this problem and why just for toshiba , my friends havent this kind of problem .

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You laptop has ATI Mobility Radeon™ HD 4530 graphics chip (source)

In recent versions of their proprietary driver AMD removed support for Radeon 2xxx, 3xxx and 4xxx series. You need to use a "legacy" or open-source drivers.

See this answer for more details

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