Documentation for colord-sane

[Joe Zeff]

I've been trying to get the nVidia drivers to work again on my desktop, 
using F 17.  Instead of using the binary blob directly, and having to do 
it again and again every time the kernel updates, I've been trying this 
guide: http://forums.fedoraforum.org/showthread.php?t=204752 which 
worked fine with my old nVidia card.

Alas, every time I've tried, the system hangs, with this as the last two 
lines on the screen:

[   37.160831] usb 1-4: usbfs: interface 1 claimed by usblp while 
'colord-sane' sets config #1
[   42.792091] usb 1-4: usbfs: interface 1 claimed by usblp while 
'colord-sane' sets config #1

After this, the computer just sits there with no disk activity.  I can 
use ^Alt-F2 to get to a different terminal and log in as root just fine. 
  Top shows that nothing is going on.  If I use yum to remove the 
drivers and reboot, it works, as does booting into an older kernel using 
nouveau.  Once that's done, /var/log/messages has another set of the 
above lines, followed by this:

khorlia colord-sane[665]: (colord-sane:665): CdSane-WARNING **: failed 
to create device: 
GDBus.Error:org.freedesktop.ColorManager.AlreadyExists: device id 
'sane-Canon PIXMA MX410' already exists

I've done quite a bit of searching and haven't been able to find any 
documentation on the service.  In fact, I've even looked up various bugs 
at Bugzilla, and emailed the person one of them was assigned to, asking 
for a pointer to the info I needed, but haven't had a reply after well 
over 24 hours.  (Not a complaint; people get busy.)  If anybody can 
point me in the right direction, I'd appreciate it because, if nothing 
else, I might be able to learn how to get the trouble-shooting info I 
need.  And, while I'm thinking about it, there are no AVC alerts, so 
it's not related to SELinux.