[cups] Problem with cups selecting manual tray on HP laserjet

[Steinar Bang]

Now here's a weird thing: this time the printer picked the paper from
the regular tray, instead of waiting for a sheet to be fed into the
manual slot.

So the result was waiting for me when I got down.

Yesterday it didn't work.

Today it does.

I have made no changes on the GNU/linux side. Ie. no config changes and
no updates.

Well, at least: no changes except "cupsctl --debug-logging"

But I have printed to the printer from a windows machine, with tray 2
explicitly selected.

Is it possible that that printing changed the printer somehow?

Or is it black magic...?

(And... will it go back to expecting paper to be fed from the manual
slot when it's least convenient that it does so...?)