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[ubuntu] video freeze on hp-compaq dx2250M (ati radeon xpress 200 video)

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After clean install of 12.04 64-bit, video keeps locking up. Will lock up with mouse movement (especially vertical), and sometimes just on its own. Have separete HDD with Win XP Pro SP3 and that works fine. Output of lspci -nn | grep VGA is 01:05.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI RS482 [Radeon Xpress 200] [1002:5974]. I have not done anything to video drivers that Ubuntu installed. Monitor is Dell 2410 (1900 x 1200) operating in portrait mode).

Would like tohear from anyone who has 12.04 64-bits installed on hp-compaq dx2250M.

Thank you,

John

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