Am 27.02.2012 11:07, schrieb Mark Morgan Lloyd:
Henry Vermaak wrote:
On 26/02/12 13:29, Mark Morgan Lloyd wrote:
I've had this sort of requirement in the past, specifically when using
libusb (i.e. the program needed sufficient privilege to grab the
device).
You need udev rules that set the user/group permissions for the
devices that you use. You don't need to run as root.
I'd be happy to be proven wrong, but my understanding is that you do
since there is one specific kernel call (in effect, telling the kernel
to release an unrecognised device to an unprivileged program) that won't
work otherwise.
I already managed the following some time ago for a scanner that was not
supported by SANE:
* setup a Windows VM in QEMU
* tell QEMU to pass the scanner to the VM
If I now started the VM I became a "permission denied" error when it
tried to open the corresponding dev node. Now I simply changed (at that
time without udev rules, because they somehow didn't work as I wanted
them to) the group of the corresponding device file
(/dev/usb/{bus}/{device}) to a group my user is part of and Tada! it
worked. So no, you don't need Root access for an unrecognized device.
Regards,
Sven
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