5. There is a bug in Gnome pertaining to this, so the sound settings method doesn't work. You will have to blacklist your PC speaker module. After installing, open a terminal window, and run
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sudo gedit /etc/modprobe.d/blacklist
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blacklist pcspkr
4. This is supposed to be fixed in the final version.
3.This is supposed to be fixed also.
2. Not sure. Most distros are switching to Pulseaudio, so I am lost now. Alsa isn't used by default. Try switching to pulseaudio in the sound settings.
1. Run
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nvidia-settings
I ran across this page a few days back while searching for something else. It will answer your last two questions. Just search for "Global Hotkeys" and "Dock Window". Avant is already in the repos. http://priyank.co.in/readarticle.php?article_id=18