I can confirm this bug for Ubuntu 9.04 Alpha 5 64-Bit with all updates
as of today. There have been issues with Ubuntu and this MacBook Pro
rev. 3 here in the past (eg one day after some update I couldn't get any
sound any more at all), and sound quality has been low and max volume
has been too low in the past. But now when I start the new 9.04 system
the sound is even far worse than with 8.10. It's like rough and slightly
crackling. No good at all.
Seems to me sound has been far better when I booted up the system for
the first time. I haven't done any substantial changes on the system
since then except for installing the proprietary Nvidia-180 driver (I
would have tried the Nouveau open source driver but the installation
routine did not offer to do so.)
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Hardy: sound level low, poor quality on Macbook Pro
https://bugs.launchpad.net/bugs/234165
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