W520 docking station audio problems

My new W520 is nice but it has a few quirks:
1. When plugged into the docking station, my external speakers (Klipshe desktop) have bad background noise, like grinding metal when volume knob is at 20% or more. Unplugging the audio (green) cable from the docking station eliminates the noise, and the cable works great when plugged into my iPhone. The noise is apparently coming from the docking station!
2. Undocking the W520 causes the audio to no longer work. The Control Panel, Sound page shows just "Conexant 20672 SmartAudio HD" default device. That test results in "Failed to play test tone".
Any help or recommendations is appreciated !
Thank you,
Steve

Also please check Lenovo.com for an updated driver. I think there have been 2 drivers out in the past 3 weeks for the Conexant.
Perry
Perry
W520, I7 2720QM, M4 512 GB SSD OS/Program Disk, C300 256 GB Data Disk in Ultrabay Caddy; X220, I7 2620, Samsung 256 GB SSD, Intel 310 mSata Drv, T61, ancient but working, Asus MoBo, I7 2600k overclocked

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**Click the KUDOS thumb up on the left to say 'Thanks'**
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I wonder what are the best practices to eject a laptop safely?
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I used to encounter problems ejecting my W500 from its docking station, even when I did everything correctly. As a result, I got into the habit of shutting the darn computer off (completely), then ejecting it.
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W520 docking station audio problems

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