[cups] MacOS to Linux CUPS intermittent "printer not connected" problem

[Michael Sweet]

Keith,

What version of Pi are you using?  Are you using the built-in Wi-Fi on your Pi?

I seem to remember seeing some reports of Wi-Fi issues with older Raspberry Pi's that required some settings changes to prevent the Wi-Fi adapter from going to sleep (or something along those lines).


> On Sep 24, 2018, at 4:16 AM, Keith Oborn <keith.oborn at keble.oxon.org> wrote:
> 
> I’m running CUPS on a Raspberry Pi, drving a Kyocera laser, with a couple of Macs talking to it.
> 
> The Add Printer dialog on the Macs works fine: always sees the CUPS printer within seconds - tried removing and re-adding, and there is no real delay in seeing “printer at pi" as a Bonjour device.
> 
> When printing, however, both Macs regularly - but intermittently - show “printer is not connected” or “looking for printer” for arbitrarily long periods. They always print in the end. 
> 
> Sometimes a “pause. resume” on the Mac queue will fix it, sometimes not. A restart of CUPS on the Pi always seems to fix it.
> 
> This doesn’t seem to depend on recent print activity: sometimes multiple jobs are delivered immediately after the first, sometimes the first is delivered immediately and the second is delayed, sometimes the first is delayed, etc. I can see no pattern.
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_________________________________________________________
Michael Sweet, Senior Printing System Engineer