[ubuntu] Displaying slowly at ATI AXP AC97 (sound and movie)

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http://ubuntuforums.org – hi i installed ubuntu hardy for my uncle's laptop. it uses ATI AXP AC97 for sound card. there is no sound when desktop starts. but in the login screen i heard "tam-tam-tam"(this is a login page sound.) thats all normal i installed all codecs for movie and audio. when i started to play mp3 or mpg, it starts and goes very slowly. but i didn't hear anything. help me please :guitar::guitar::guitar::popcorn::KS:) (Hardware)