Re: CUPS on Bullseye and Bookworm

[Brian <ad44@cityscape.co.uk>]

On Mon 15 May 2023 at 18:29:12 +0100, Brian wrote:

> On Mon 15 May 2023 at 16:33:42 +0100, Brian wrote:
> 
> [...]
> 
> > Good. The issue is solved, but how do you feel about being adventurous?
> > 
> > Assuming you have deleted the three non-working queues,'lpstat -a' and
> > s-c-p should show only M234. On dragon do
> > 
> >   systemctl stop cups-browsed
> > 
> > Check that 'lpstat -l -e' still shows the printer as
> > 
> >    HP_LaserJet_MFP_M234sdw_C0FB67
> > 
> > * Now print: 'lp -d HP_LaserJet_MFP_M234sdw_C0FB67 /etc/nsswitch.conf'.
> > * Immediately afterwards do 'lpstat -a'. What do you observe?
> > * Run 'lpstat -a' a minute or so later. What do you observe?
> 
> Thinking on: the test can be carried out withoit using papaer and ink.
> For the first step:
> 
> * Execute 'lpoptions -p HP_LaserJet_MFP_M234sdw_C0FB67 -l'.

For illustrative purposes on a machine without cups-browsed:

  brian@test-new:~$ lpstat -a
  lpstat: No destinations added.
  brian@test-new:~$ 

There aren't any local print queues.

  brian@test-new:~$ lpstat -e
  ENVY4500
  ENVY4500_USB
  RX420
  brian@test-new:~$

Shows all available destinations on the local network. These are the names
of prospective (on-demand) queues.

  brian@test-new:~$ lpoptions -p envy4500 -l
  PageSize/Media Size: 100x150mm 111.76x152.4mm 3.5x5 3.5x5.Borderless 3x5
  4x6 4x6.Borderless 5x7 5x7.Borderless 5x8 8x10 8x10.Borderless *A4
  A4.Borderless A5 A6 A6.Borderless B5 Env10 EnvA2 EnvC5 EnvC6 EnvChou3
  EnvChou4 EnvDL EnvMonarch EnvPersonal Executive ISOB5 Legal Letter
  Letter.Borderless Postcard Postcard.Borderless Statement Custom.WIDTHxHEIGHT
  MediaType/Media Type: *Stationery PhotographicGlossy
  cupsPrintQuality/cupsPrintQuality: Draft *Normal High
  ColorModel/Output Mode: *RGB Gray Gray16 DeviceGray DeviceRGB AdobeRGB
  Duplex/Duplex: *None DuplexNoTumble DuplexTumble
  OutputBin/OutputBin: *FaceUp
  brian@test-new:~$

The destination has been contacted and querued for the device's attributes.

  brian@test-new:~$ lpstat -a
  ENVY4500 accepting requests since Tue 16 May 2023 14:50:01 BST
  brian@test-new:~$

A local queue for the ENVY4500 destination has been created. Unlike a queue
created manually or with cups-browsed it is a *temporary* queue. Just over
a minute later:

  brian@test-new:~$ lpstat -a
  lpstat: No destinations added.
  brian@test-new:~$

This is the future of printing and it is here now. No manual queues. No
cups-browsed.

-- 
Brian.