Sven Barth wrote:
Am 27.02.2012 11:07, schrieb Mark Morgan Lloyd:
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.
The reason it didn't work as expected might have been because the
insertion of otherwise-unrecognised devices in /dev/usb is a
comparatively recent feature. Checking, it's not in 2.6.18 (Debian Etch)
but is in 2.6.32 (Debian Lenny). Allow for a few kernel steppings for it
to actually /work/ :-)
But to make those changes (and were they in the host or the guest?) you
needed root access. So you've moved the problem rather than fixing it
permanently.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
--
_______________________________________________
Lazarus mailing list
[email protected]
http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
