Public bug reported:

1. Playback.
By default, on clean install, Surround speakers are muted, which are 
considered/used as primary speakers while playing any sounds.
Changing volume on Front speakers have no effect on sound playback. So 
basically Surround is considered as Front. Note that this laptop has 4.1 
speakers (2 front, 2 surround, subwoofer).
Solution for playback: unmute Surround and use its volume control as it was 
Front.

2. Recording.
There is 7 sliders in Recording section in alsa mixer: Capture, Capture1, 
Capture2, Digital, Mux, Mux1, Mux2.
Build-in two (as stereo) microphones works only if Capture and Mux are unmuted, 
but Mux slider acts weird - can't be positioned between ~90 - ~99%, because it 
"jumps" to lower position or up to 100%. Also setting it to 100% makes 
recording sound bad, noisy, as it was overloaded.
Solution for recording from mic: select Capture as main recording stream, and 
lower Mux volume.

3. Audio jacks.
The laptop has 4 rear jacks for 5.1 output (Front, Surround, Center, 
Subwoofer). None of those work as output, putting jack in any doesn't affect 
playback (no muting or whatsoever).
I have found no solution for that.


Additional info:

$ lspci
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory 
Controller Hub (rev 03)
00:01.0 PCI bridge: Intel Corporation Mobile PM965/GM965/GL960 PCI Express Root 
Port (rev 03)
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI 
Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio 
Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 
(rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 
(rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 3 
(rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 4 
(rev 03)
00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 
(rev 03)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI 
Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f3)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller 
(rev 03)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE 
Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA 
AHCI Controller (rev 03)
01:00.0 VGA compatible controller: ATI Technologies Inc Unknown device 9583
01:00.1 Audio device: ATI Technologies Inc RV630/M76 audio device [Radeon HD 
2600 Series]
02:06.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05)
02:06.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host 
Adapter (rev 22)
02:06.2 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev 12)
02:06.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter 
(rev 12)
02:06.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev ff)
10:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN 
Network Connection (rev 61)
20:00.0 Mass storage controller: Silicon Image, Inc. Sil 3531 
[SATALink/SATARaid] Serial ATA Controller (rev 01)
28:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8055 PCI-E 
Gigabit Ethernet Controller (rev 13)

Ubuntu 8.04 x64 (current beta)

$ uname -a
Linux madneon 2.6.24-15-generic #1 SMP Fri Apr 4 03:10:59 UTC 2008 x86_64 
GNU/Linux

See also http://wiki.ubuntu.com/LaptopTestingTeam/HPPavilionHDX9050

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
HP Pavilion HDX 9050 EG bad sound
https://bugs.launchpad.net/bugs/213577
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