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How to know whether CONFIG_USB_DEVICEFS is enabled or not in the kernel?

Asked by Uqbar

In order to have a USB scanner working I need to have CONFIG_USB_DEVICEFS enabled in the kernel.
Which seems to be a good thing anyway.
How to know whether CONFIG_USB_DEVICEFS is enabled or not in the kernel?

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Philip Muškovac
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Best Philip Muškovac (yofel) said : 		#1

you can check the configuration file for your kernel in /boot, /boot/config-2.6.35-22-generic is an example.
Afaik CONFIG_USB_DEVICEFS has been disabled since karmic since it's incompatible with udev, I don't know much about this though.
Rationale: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/488274

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Uqbar (uqbar) said : 		#2

Thanks Philip Muškovac, that solved my question.