Hi Mirone, its been a while since you asked me about the dual-link so here goes.
1) I did the dual-link DSDT edit ...copied it from DSDT for probook 4530 as most of the stuff is the same (except audio ) :- I get the same reuslt. ... A grey screen always happens with dual-link edit for me. Solution to this was to just remove the line for dual-link and leave the graphics-id and platform-id in the DSDT edit. Now I have full HDMI Video.... scaling works too no hanging on mirroring too.
2) After 10.8.4, I get funny red selection box on anything pictures or icons in my system. Don't know why. mostly happens on thumbnails only.
3) Patched my EDID to get a custom one by using monitor id and entechtaiwans monitor utility. Its a different backlight display compared to other HP models it seems.
4) HDMI Audio is not working I tried with windows and it works .... maybe I need to patch another node in my platform.xml?? I saw another node 14 (working audio one is 13, if you remember on dv6) which also is stereo out.
5) Even after EDID fix, I still get graphic glitches on and off? Its weird, dunno why.
Any ideas on hdmi audio fix? I tried patching snbgraphics.kext but the old and new output is exactly the same ...following the thread on this forum. and bcc9. Please help me out and thanks for your help till date.
If you need any files for reference, let me know. I have saved everything from my codecverbs to the edid details file.
try this: http://www.sendspace.com/file/lpuflr