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Random Ubuntu hangs (freeze), hard reset needed
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´Ù¸¥¹öÀü¿¡¼­´Â ³ªÅ¸³ªÁö ¾Ê´Â°Å °°À¸³ª Ubuntu 13.04 / CentOS 6.X ¹öÀü¿¡¼­ È®ÀεǾúÀ½...

È®ÀÎ OS Version
 - 11.04/11.10 32bit, 64bit  
 - 12.04/12.10 32bit, 64bit  
 - 13.04  64bit
 - Cent 6.X 64bit

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# /etc/default/grub
GRUB_CMDLINE_LINUX="edd=on"

# update-grub
 EDD (Enhanced Disk Drive)

CentOS 6.X
/etc/grub.conf
ºÎÆÿɼǿ¡ edd=on nolapic Ãß°¡




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Common Kernel Options

This list is not comprehensive but it contains some common boot options which may be added to the end of the boot command.
Option
Impact
vga=xxx
Set your framebuffer resolution to VESA mode xxx. Check here for a list of possible modes.
acpi=off OR noacpi
This parameter disables the whole ACPI system. This may prove very useful, for example, if your computer does not support ACPI or if you think the ACPI implementation might cause some problems (for instance random reboots or system lockups).
acpi=force
Activates the ACPI system even if your computer BIOS date is older than 2000. This parameter overrides acpi=off and can also be used with current hardware if the ACPI support is not activated despite apm=off.
pci=noacpi OR acpi=noirq
These parameters disable the PCI IRQ routing
pci=acpi
This parameter activates the PCI IRQ routing
acpi_irq_balance
ACPI is allowed to use PIC interrupts to minimize the common use of IRQs.
acpi_irq_nobalance
ACPI is not allowed to use PIC interrupts.
acpi=oldboot
Deactivates the ACPI system almost completely; only the components required for the boot process will be used.
acpi=ht
Deactivates the ACPI system almost completely; only the components required for hyper threading will be used.
noapic
Disable the "Advanced Programmable Interrupt Controller (APIC)".
nolapic
Disable the "local APIC".
apm=off OR noapm
Disable the Advanced Power Management.
irqpoll
Changes the way the kernel handles interrupt calls (set it to polling). Can be useful in case of hardware interrupt issues.
acpi.power_nocheck=1 OR acpi_osi=linux
Disable the check of power state or changes the OS compatibility reported to the BIOS. Necessary on some broken BIOSes to make temperature/fan control work.
 
 
 
 
 

acpi=off or noacpi

Disables the "Advanced Configuration and Power Interface" or ACPI which is used for power management in general (Fan speeds, sleep states...). In some cases like running the installer from a Live USB or booting a laptop it is needed for compatibility with the motherboard and how it handles/mishandles ACPI. Just in case you are wondering, the difference between acpi=offand noacpi is that acpi=... can accept more values. For example acpit=force,irq.

noapic

Disables the "Advanced Programmable Interrupt Controllers" which is used to resolve hardware conflicts for interrupts. The effects of using a combination between noacpi and noapicdepends on the hardware. In some cases, disabling both will solve booting problems, in others it will create problems. Suggestions are that you try one at a time.

nolapic

Disables the "Local Advanced Programmable Interrupt Controler" which applies to newer CPUs and they are handled. nolapic is commonly used when you are using old hardware. Many times even withnoapic`.

edd=on

Enables the "Enhanced Disk Drive" service which is used by VERY old motherboards to provide support for hard drives, specially ones that go beyond the 32GB barrier, which by todays standards is like the size of a normal flash drive. Anyway, if you have an old motherboard and a HDD bigger than 32GB, then use edd=on.

nodmraid

Disables the "Device Mapper RAID" which is used for everything related to RAIDs. Not recommended if you want to use RAIDs.

nomodeset

Disables the video from using modesets which are used for example for better resolutions and graphics. If you are using an old video card, old monitor or both, then activate this mode.

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