CONFIG_USB_PERSIST: USB device persistence during system suspend (DANGEROUS)

General informations

The Linux kernel configuration item CONFIG_USB_PERSIST:

• prompt: USB device persistence during system suspend (DANGEROUS)
• type: bool
• depends on: CONFIG_USB && CONFIG_PM && CONFIG_EXPERIMENTAL
• defined in drivers/usb/core/Kconfig
• found in Linux kernels: 2.6.23–2.6.25

Help text

If you say Y here and enable the "power/persist" attribute for a USB device, the device's data structures will remain persistent across system suspend, even if the USB bus loses power. (This includes hibernation, also known as swsusp or suspend-to-disk.) The devices will reappear as if by magic when the system wakes up, with no need to unmount USB filesystems, rmmod host-controller drivers, or do anything else.

WARNING: This option can be dangerous!

If a USB device is replaced by another of the same type while the system is asleep, there's a good chance the kernel won't detect the change. Likewise if the media in a USB storage device is replaced. When this happens it's almost certain to cause data corruption and maybe even crash your system.

If you are unsure, say N here.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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