I had this problem on my Dell desktop, too.
I ended up following these instructions
https://help.ubuntu.com/community/HdaIntelSoundHowto
And I ended up adding this line to /etc/modprobe.d/alsa-base and rebooting and 
I didn't have the scratchy noise anymore:
options sna-hda-intel model=dell-d82

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laptop's left speaker makes scratching noise while playing sound
https://bugs.launchpad.net/bugs/285521
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