bios
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BIOS
BIOS settings
After saving the settings sometimes a second boot might be needed for the settings to take effect
Some less obvious BIOS settings and what they mean
Acpi states
Standby explained S1 S3
| Name | Recommended setting | Description |
|---|---|---|
| ACPI | Enabled | Advanced Configuration and Power Interface |
| ACPI Standby state | S3 | See Advanced Configuration and Power Interface Power states |
| AZALIA | ENABLED if audio is used | Azalia Audio Codec, is part of the Intel High Definition Audio (HD Audio) standard. Introduced to improve audio quality and capabilities |
| DVMT Mode Select (Memory) | DVMT | Allows the system to dynamically allocate video memory based on the needs of the applications running. See DVMT Mode Select |
| FIXED Mode (Memory) | FIXED | FIXED allocates a fixed amount of memory for graphics use at boot time. A specific amount of RAM is reserved for the GPU, regardless of whether it is fully utilized or not. |
| DVMT/FIXED (Memory) | DVMT | Uses as little as possible memory for graphics so applications have the maximum amount of memory available. Only use FIXED if there are graphics issues |
| Execute Bit Support | Enabled | See NX bit (Intel XD bit) |
| HPET | Enabled | See High Precision Event Timer |
| Intel EIST, Speedstep | Enabled | Allow the clock speed of the processor to be dynamically changed by software. See Speedstep |
| IOAPIC | Enabled | See Intel I/O Advanced Programmable Interrupt Controller |
| MPS Table version | 1.4 | MultiProcessor Specification (MPS) |
| PCI BusMaster | Enabled | When PCI bus mastering is used, IDE/ATA devices use DMA modes to transfer data instead of PIO (Programmed Input/Output). See also PCI IDE Bus Mastering and Wikipedia |
| PCI IDE BusMaster | Enabled | See: PCI BusMaster |
| PCI latency timer | 32 | The PCI Latency Timer controls how long each PCI device can hold the bus before another takes over |
| Primary Graphics Adapter | IGD | IGD Integrated Graphics Adapter, the graphics adapter on the motherboard |
| Recall VGA BIOS from S3 | Disable | |
| Set Limit CPUID MaxVal to 3 | Disabled | Only enable if your OS can not handle values >3 |
| Spread spectrum | Disabled | EMI prevention. See Spread Spectrum Control |
| VGA Share Memory | What is needed |
UEFI
Booting from a CD or DVD on an UEFI system
When, on an UEFI based system the system boots from CD but not from DVD check the UEFI settings. There is a setting which has to be set to UEFI to make the system boot from DVD
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bios.txt · Last modified: by wim