HP EliteDesk 800 G4 Workstation Edition User Manual Page 145
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Audio
All HP workstations come with built-in audio hardware. The audio hardware is supported by the Advanced
Linux Sound Architecture (ALSA) drivers included with all modern Linux distributions.
The audio hardware provides basic playback and recording features. The ability to simultaneously play audio
from multiple sources, such as applications and CDs, is provided in the ALSA driver that provides audio mixing.
The performance of software audio mixing and playback is greatly improved in ALSA version 1.0.13 and later.
After the driver is installed, the optional NVIDIA and AMD graphics cards that are supported in HP
workstations also provide audio functionality over HDMI. The signal can be passed through the DisplayPort
connector to a monitor with audio capabilities. The vendor driver must be installed. Such a
conguration
might present two audio hardware choices. If you do not hear sound through the speakers, one possible
reason is that the graphics card (default) is selected for audio output instead of the DisplayPort. Check the
audio settings (for example, Sound in gnome-control-center).
In some systems, embedded Intel HD graphics may also present a similar HDMI audio device that can be used
through the DisplayPort interface. No proprietary driver is needed for this device, just a suciently recent
kernel.
Hyper-Threading Technology
The Z Series Workstations support Hyper-Threading Technology (HTT), an Intel technology that improves
processor performance by enabling the processor to simultaneously perform multiple tasks. The operating
system treats an HTT-enabled processor as two virtual processors and shares the workload between them
when possible. This feature can be used only if the operating system support multiple processors and is
specically optimized for HTT.
To enable HTT:
1. During startup, press F10 to enter Computer Setup (F10) Utility.
2. Select Advanced > Performance Options.
3. Set Intel Hyperthreading to Enable, and then press F10 to exit the menu.
4. Select Main > Save Changes and Exit.
5. Restart the system to enable HTT.
NOTE: On most recent Linux distributions, the kernel automatically detects that HTT is enabled and
works correctly.
Audio 137
- Maintenance and Service Guide 1
- Safety warning notice 3
- Table of contents 5
- 1 Product features 9
- Front panel components 10
- Rear panel components 11
- Serial number location 12
- 2 Illustrated parts catalog 13
- Computer major components 7 15
- Miscellaneous parts 16
- Generating static 17
- Grounding the work area 18
- Operating guidelines 19
- Routine care 20
- Service considerations 21
- Cables and connectors 22
- Hard Drives 22
- Lithium coin cell battery 22
- SATA hard drives 23
- SATA data cable 23
- SMART ATA drives 23
- Cable management 24
- Preparation for disassembly 25
- Access panel 26
- Front bezel 27
- Front bezel security 28
- Removing bezel blanks 29
- System board connections 31
- Populating DIMM sockets 32
- Removing and installing DIMMs 33
- Drive cage 35
- Drive positions 36
- Removing a 5.25-inch drive 37
- Installing a 5.25-inch drive 38
- Expansion cards 53
- Optional rear port 58
- Rear fan 59
- Hood lock (solenoid) 60
- Hood sensor 61
- Option board 62
- Fan sink 63
- Up to 65 W processor models 64
- 95 W processor models 64
- Processor 66
- WLAN module 67
- Card reader 69
- Power supply 70
- Antennas 71
- System board 73
- System board callouts 76
- Computer Setup–Main 79
- Computer Setup—Security 81
- Computer Setup—Advanced 84
- Computer Setup—UEFI Drivers 89
- Safety and comfort 90
- Helpful hints 91
- Solving general problems 92
- Solving general problems 85 93
- Solving general problems 87 95
- Solving power problems 96
- Solving hard drive problems 97
- Solving display problems 100
- Solving display problems 93 101
- Solving audio problems 103
- Solving printer problems 105
- Solving Network Problems 109
- Solving memory problems 111
- Solving software problems 117
- Resetting the password jumper 125
- A Battery replacement 133
- B Power cord set requirements 136
- Country-Specic Requirements 137
- Nonvolatile memory usage 140
- Nonvolatile memory usage 133 141
- Questions and answers 142
- D Linux technical notes 144
- Hyper-Threading Technology 145
- NVIDIA graphics workstations 146
- AMD graphics workstations 147
- E Specications 148
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