It should be a kernel issue,
widely confirmed at this thread:
http://aldeby.org/blog/index.php/en-hp-pavilion-multimedia-buttons-configuration-under-linux-linux-quickplay.html
** Changed in: linux (Ubuntu)
Sourcepackagename: None = linux
Status: New = Confirmed
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HP dv Pavilion laptop
*** This bug is a duplicate of bug 278859 ***
https://bugs.launchpad.net/bugs/278859
** Changed in: hal (Ubuntu)
Sourcepackagename: linux = hal
** This bug has been marked a duplicate of bug 278859
Broken hotkeys on HP Pavilion dv6500 laptop
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HP dv Pavilion laptop + Ubuntu 8.10: Some
Confirmed on HP Pavilion dv2699.
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HP dv Pavilion laptop + Ubuntu 8.10: Some multimedia keys no longer working
https://bugs.launchpad.net/bugs/298478
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ubuntu-bugs mailing list
I can confirm this problem using Ubuntu 8.10 64 bit on an HP Pavilion
DV6700z. All touch sensitive buttons work except for DVD and
QuickPlay. Related, all buttons on the included remote control are
functioning with the exception of DVD, QuickPlay, and Windows Logo
(Super key). Nothing I tried
