Hi,
Thanks for the workaround.

I too have this problem on my laptop after a fresh Hardy install.
Hardware details:
https://wiki.ubuntu.com/LaptopTestingTeam/CompaqPresarioV2600CTO

A few points:
- this is a regression of sorts. I did not have this problem with Gusty, but do 
have it with Hardy 32bit.
- this also affects writing cds/dvds. When writing a disc, my entire system 
slows down to an unusable crawl without the workaround. I just tried writing a 
dvd with the workaround and it was perfectly fine.
- A dvd that I wrote yesterday was corrupt, so the slowness is more than just 
annoying- it causes errors with writing.

So this is a pretty serious bug that affects basic functionality. I hope
it will be prioritised accordingly.

Cheers,
Randall.

-- 
DVD playback jerky due to ata_generic module disabling DMA
https://bugs.launchpad.net/bugs/175022
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