I reinstalled CUPS because it was having problems, but really I just configured it incorrectly, and now it doesn't detect the USB printer connected to my computer that it used to detect! I've tried everything: removing the usblp module (which was never loaded in the first place anyways), changing permissions, etc., but it still doesn't detect it, even though lsusb shows the Samsung CLX-3185 printer is connected.

Is there some permissions issue preventing CUPS from automatically detected my Samsung CLX-3185 connected via USB?

I'm using CUPS 1.5.4.

(BTW, when will there be a Slack package for a more recent CUPS?)

thanks

Cups is the one linux program I have found to respond positively to the established m$ technique for borky software: delete and reinstall.

I would open http://localhost:631 and delete the printer(s). Then check /etc/cups/printers.conf for a lack of printers, and /etc/cups/cups.conf for a lack of nonsense.

Then reinstall the printer.

I've done that. I've deleted everything in /etc/cups/ and reinstalled, but CUPS still doesn't detect my USB printer, even though lsusb shows it connected.

Do you have the same issue as root?

1. Is cups running? /etc/rc.d/rc.cups status
2. Can you access the cups admin at 127.0.0.1:631?


I don't know if this will help but here is my printers.conf
# Printer configuration file for CUPS v1.5.4
# Written by cupsd on 2014-05-20 19:52
# DO NOT EDIT THIS FILE WHEN CUPSD IS RUNNING
<DefaultPrinter HP_Printer>
UUID urn:uuid:50526511-10fb-3c13-747c-3d25f932b742
Info HP Photosmart C4200 series
Location Office
MakeModel HP Photosmart c4200 Series hpijs, 3.13.10
DeviceURI hp:/usb/Photosmart_C4200_series?serial=CN81UR91VC04VP
State Idle
StateTime 1400633559
Reason marker-supply-low-warning
Type 8425500
Accepting Yes
Shared Yes
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
OpPolicy default
ErrorPolicy stop-printer
</Printer>

and this is my cupsd.conf

LogLevel warn
SystemGroup sys root
# Allow remote access
Port 631
Listen /var/run/cups/cups.sock
# Enable printer sharing and shared printers.
Browsing On
BrowseOrder allow,deny
BrowseAllow all
BrowseRemoteProtocols CUPS
BrowseAddress @LOCAL
BrowseLocalProtocols CUPS
DefaultAuthType Basic
WebInterface Yes
<Location />
# Allow shared printing and remote administration...
Order allow,deny
Allow @LOCAL
</Location>
<Location /admin>
# Allow remote administration...
Order allow,deny
Allow @LOCAL
</Location>
<Location /admin/conf>
AuthType Default
# Allow remote access to the configuration files...
Order allow,deny
Allow @LOCAL
</Location>
<Policy default>
JobPrivateAccess default
JobPrivateValues default
SubscriptionPrivateAccess default
SubscriptionPrivateValues default
<Limit Create-Job Print-Job Print-URI Validate-Job>
Order deny,allow
</Limit>
<Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription
Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default CUPS-Get-Devices>
AuthType Default
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer A
ctivate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
AuthType Default
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Cancel-Job CUPS-Authenticate-Job>
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit All>
Order deny,allow
</Limit>
</Policy>
<Policy authenticated>
JobPrivateAccess default
JobPrivateValues default
SubscriptionPrivateAccess default
SubscriptionPrivateValues default
<Limit Create-Job Print-Job Print-URI Validate-Job>
AuthType Default
Order deny,allow
</Limit>
<Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription
Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
AuthType Default
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription
Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
AuthType Default
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default>
AuthType Default
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer A
ctivate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
AuthType Default
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Cancel-Job CUPS-Authenticate-Job>
AuthType Default
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit All>
Order deny,allow
</Limit>
</Policy>

I have that sort of issue, and it's due to firmware not being installed.
I just have a half-assed way around it because I'm dead busy/lazy/disinterested.

How about something like this in /etc/modprobe.d/

postinstall <module> <command to install firmware>
e.g.
postinstall usblp0 /usr/bin/cat /path/to/whatever_file > /dev/µsb/lp0

The "correct" way is usually to make udevd do it, but you're on your own there.

1 members found this post helpful.

YesYesWell, I don't have that yet because I haven't installed any printers because it can't detect it!Mine's pretty much the same, except I added "lp":
"SystemGroup sys root"

Yes, I think this is the issue. When I installed the March 11, 2014, Linux Samsung driver, I think the installer did have some issue with udevd. thanks

my printer driver came with express instructions to remove the system-config-printer package which surprisingly is installed in slackware. It overwrites apparently useful udevd stuff, so an 'upgradepkg --reinstall' of udevd might help.

1 members found this post helpful.

Nope. I tried reinstalled and restarted it, but it still doesn't work. I really thought that might work, too. thanks, though

Well there's a script installed here for firmware which does a bit of checking, and then runs

cat /path/to/firmware >/dev/usb/lp0

Have you verified that it is firmware. Is the fiirmware installed?