SANE can't find device if used through VNC - F9

Hello,
I got a F9 machine that I access through VNC. If I'm at the machine, I can open SANE and scan without any problems. If I, however, do this remotely through VNC, SANE cannot find my HP scanner. 
I tried the same using X11 from a Mac and it didn't work either. However, if I login as root and launch SANE, it works, if finds the scanner and scans.
Any idea how to solve this issue?
Thanks,
EJ

> Hello,

I got a F9 machine that I access through VNC. If I'm at the machine, I can open 
SANE and scan without any problems. If I, however, do this remotely through VNC,
> SANE cannot find my HP scanner.

I tried the same using X11 from a Mac and it didn't work either. However, if I
> login as root and launch SANE, it works, if finds the scanner and scans.
> Any idea how to solve this issue?
> Thanks,
> EJ

Any takers? I've had problems with VNC in two machines so far.

> Hello,

I got a F9 machine that I access through VNC. If I'm at the machine, I can open 
SANE and scan without any problems. If I, however, do this remotely through VNC,
> SANE cannot find my HP scanner.

I tried the same using X11 from a Mac and it didn't work either. However, if I
> login as root and launch SANE, it works, if finds the scanner and scans.
> Any idea how to solve this issue?
> Thanks,
> EJ

Anybody? I'm still searching for an answer on this issue. Still unresolved.
EJ

> > Hello,
>
> I got a F9 machine that I access through VNC. If I'm at the machine, I can open 
> SANE and scan without any problems. If I, however, do this remotely through VNC,
> > SANE cannot find my HP scanner.
>
> I tried the same using X11 from a Mac and it didn't work either. However, if I
> > login as root and launch SANE, it works, if finds the scanner and scans.
> > Any idea how to solve this issue?
> > Thanks,
> > EJ
>
> Anybody? I'm still searching for an answer on this issue. Still unresolved.
> EJ

No suggestions?

[Rick Stevens]

[e-mail] wrote:
> > > Hello,
> >
> > I got a F9 machine that I access through VNC. If I'm at the machine, I can open 
> > SANE and scan without any problems. If I, however, do this remotely through VNC,
> > > SANE cannot find my HP scanner.
> >
> > I tried the same using X11 from a Mac and it didn't work either. However, if I
> > > login as root and launch SANE, it works, if finds the scanner and scans.
> > > Any idea how to solve this issue?
> > > Thanks,
> > > EJ
> >
> > Anybody? I'm still searching for an answer on this issue. Still unresolved.
> > EJ
>
> No suggestions?

When going in remotely, are you logging in as root or as a "normal"
user?  That may have something to do with it.  In the past, some SANE
backends didn't run if you weren't root.  I thought that was fixed, but
it's a possibility.

I have a Canon LIDE at home and it works fine as me or as root.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer                      [e-mail] -
- AIM/Skype: therps2        ICQ: 22643734            Yahoo: origrps2 -
-                                                                    -
-   "Do you suffer from long-term memory loss?"  "I don't remember"  -
-                            -- Chumbawumba, "Amnesia" (TubThumping) -
----------------------------------------------------------------------

> [e-mail] wrote:
> > > > Hello,
> >
> > I got a F9 machine that I access through VNC. If I'm at the machine, I can
>
> open
> > SANE and scan without any problems. If I, however, do this remotely through
>
> VNC,
> > > > SANE cannot find my HP scanner.
> >
> > I tried the same using X11 from a Mac and it didn't work either. However, if
>
> I
> > > > login as root and launch SANE, it works, if finds the scanner and scans.
> > > > Any idea how to solve this issue?
> > > > Thanks,
> > > > EJ
> > >
> > > Anybody? I'm still searching for an answer on this issue. Still unresolved.
> > > EJ
> >
> > No suggestions?
>
> When going in remotely, are you logging in as root or as a "normal"
> user?  That may have something to do with it.  In the past, some SANE
> backends didn't run if you weren't root.  I thought that was fixed, but
> it's a possibility.
>
> I have a Canon LIDE at home and it works fine as me or as root.

When I log in as a normal user I can't use the scanner, SANE won't find it. If I log in as root, yes, SANE finds the scanner and allows me to scan. However, I don't want to give root access to people who want to scan.
> This is probably ConsoleKit/PolicyKit in action. When you log in sat
> at the machine, you're a console user with physical access to the
> machine, and so you get permissions to access the hardware. When
> logging in remotely the permissions don't get set to allow you to
> access connected hardware. I suggest having a read about
> ConsoleKit/PolicyKit and working out what policy you need to change to
> get the permissions you want when logging in via VNC.
>
> Jonathan.

I'm lost there Jonathan. Where do I start?

[Jef Spaleta]

On Tue, Dec 2, 2008 at 2:44 PM,   wrote:
> I'm lost there Jonathan. Where do I start?

Assuming you are running a gnome desktop....there is authorizations
dialog in the system->preferences->system  menu.

you should be able to adjust the authorizations for device access...
including scanners.

-jef

[Jonathan Underwood]

2008/12/2 Jeff Spaleta :
> On Tue, Dec 2, 2008 at 2:44 PM,   wrote:
> > I'm lost there Jonathan. Where do I start?
>
> Assuming you are running a gnome desktop....there is authorizations
> dialog in the system->preferences->system  menu.
>
> you should be able to adjust the authorizations for device access...
> including scanners.

In fact... as jeff says system->preferences->system->Authorisations

Then in the left hand pane, scroll down until you see "device-access".
As a sub-item of that entry you'll see "Directly access scanners".
Select that. In the right hand pane you'll see (amongst other things)
"Implicit authorisations" ... click the Edit button. Hopefully it is
self explanatory from then on...

SANE can't find device if used through VNC - F9 (SOLVED)

> > On Tue, Dec 2, 2008 at 2:44 PM,   wrote:
> > > I'm lost there Jonathan. Where do I start?
> >
> > Assuming you are running a gnome desktop....there is authorizations
> > dialog in the system->preferences->system  menu.
> >
> > you should be able to adjust the authorizations for device access...
> > including scanners.
>
> In fact... as jeff says system->preferences->system->Authorisations
>
> Then in the left hand pane, scroll down until you see "device-access".
> As a sub-item of that entry you'll see "Directly access scanners".
> Select that. In the right hand pane you'll see (amongst other things)
> "Implicit authorisations" ... click the Edit button. Hopefully it is
> self explanatory from then on...

Bingo. Thank you so much.
Is it possible to grant these authorizations remotely through the terminal?
EJ

SANE can't find device if used through VNC - F9 (SOLVED)

[Jonathan Underwood]

2008/12/3  :
> > > On Tue, Dec 2, 2008 at 2:44 PM,   wrote:
> > > > I'm lost there Jonathan. Where do I start?
> > >
> > > Assuming you are running a gnome desktop....there is authorizations
> > > dialog in the system->preferences->system  menu.
> > >
> > > you should be able to adjust the authorizations for device access...
> > > including scanners.
> >
> > In fact... as jeff says system->preferences->system->Authorisations
> >
> > Then in the left hand pane, scroll down until you see "device-access".
> > As a sub-item of that entry you'll see "Directly access scanners".
> > Select that. In the right hand pane you'll see (amongst other things)
> > "Implicit authorisations" ... click the Edit button. Hopefully it is
> > self explanatory from then on...
>
> Bingo. Thank you so much.
> Is it possible to grant these authorizations remotely through the terminal?
> EJ

Have never done it myself - seems to involve editing an XML file, so
you'd need to do a bit of reading to find the syntax. Have a look at:

http://lwn.net/Articles/258592/

[Mikkel]

[e-mail] wrote:
> When I log in as a normal user I can't use the scanner, SANE
> won't find it. If I log in as root, yes, SANE finds the scanner and allows
> me to scan. However, I don't want to give root access to people who
> want to scan.

I wounder if you have a scanner that is not listed in
/etc/udev/rules.d/60-libsane.rules. If so, the scanner symlink would
not be created, and the console user would not be given permission
to use the device.

Mikkel

[Jonathan Underwood]

2008/12/1  :
> > Hello,
>
> I got a F9 machine that I access through VNC. If I'm at the machine, I can open
> SANE and scan without any problems. If I, however, do this remotely through VNC,
> > SANE cannot find my HP scanner.
>
> I tried the same using X11 from a Mac and it didn't work either. However, if I
> > login as root and launch SANE, it works, if finds the scanner and scans.
> > Any idea how to solve this issue?
> > Thanks,
> > EJ
>
> Anybody? I'm still searching for an answer on this issue. Still unresolved.
> EJ

This is probably ConsoleKit/PolicyKit in action. When you log in sat
at the machine, you're a console user with physical access to the
machine, and so you get permissions to access the hardware. When
logging in remotely the permissions don't get set to allow you to
access connected hardware. I suggest having a read about
ConsoleKit/PolicyKit and working out what policy you need to change to
get the permissions you want when logging in via VNC.

Jonathan.