Soundcards in laptop: which for what is responsible

On my asus k52dr i have next pci devices related to sound (linux notation from lspci):
01:00.1 Audio device [0403]: Advanced Micro Devices [AMD] nee ATI Cedar HDMI Audio [Radeon HD 5400/6300 Series] [1002:aa68]
Subsystem: ASUSTeK Computer Inc. Device [1043:1bf2]

00:14.2 Audio device [0403]: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) [1002:4383] (rev 40)
Subsystem: ASUSTeK Computer Inc. Device [1043:11b3]

First is integrated in my videocard (as i guess), while second - integrated in motherboard with soundcard (itself) from Realtek.
So, which from them for which of next functionality corresponds:
1) 3.5 front jack for headphones
2) 3.5 front jack for microphone
3) microphone "inside" i.e. talk-to-laptop (for skype etc)
4) integrated rear stereophones for laptop
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More about soundcards laptop responsible
  1. 'Stereophones', you mean speakers?

    The integrated sound card is responsible for the audio jacks, the microphone and the rear speakers.

    The GPU can be used to give sound through the HDMI port but so can the sound card.
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