HP Z220 SFF, Z220 CMT, Z420, Z620, and Z820 Workstations Maintenance and Service Guide

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
sufficiently recent kernel.
Network cards
All HP workstations include one or two integrated network interface controllers. Some support
optional NICs. Most Linux distributions have drivers for these interfaces.
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 performing 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 specifically optimized for HTT.
To enable HTT:
1. During startup, press F10 to enter Computer Setup (F10) Utility.
2. Select Advanced > Device Options.
3. Set Hyper-Threading to Enable, and then press F10 to exit the menu.
4. Select File > Save Changes and Exit.
5. Restart the system to enable HTT.
NOTE: On most recent Linux distributions (including RHEL 5, RHEL 6, SLED 11, and updates to
those streams), the kernel automatically detects that HTT is enabled and works correctly.
158 Appendix A Linux technical notes