Comprehensive def'n of marker-levels-high/marker-levels-low

[noee]

In Plasma6 print-manager, we're attempting to provide the user with some feedback on cartridge marker levels (ink, toner, etc.), however, I'm unclear on the precise def'n of the level values.

Assuming the the current level is actually a percentage (level*100/high-low).

Is the high value always 100?

Does the low level value represent a "recommended warning level" or is it the actual low value that the cartridge could actually reach on empty?

Additionally, it appears that the printers.conf file is only populated with the marker level values after the first print job is create/completed. Is this accurate?

Thx for any info

[michaelrsweet]

So the value is a percentage.

The high value is 100 (percent) for supplies that are consumed (ink, toner, etc.) and 0 (percent) for supplies that are filled (waste bottle/receptacle).

The low value is the level when the supply needs replacement soon, so a small value (5-15 percent) for supplies that are consumed and a large value (85-95 percent) for supplies that are filled.

This is (poorly) documented in the current CUPS Implementation of IPP.

In addition to marker-xxx, there are the printer-supply and printer-supply-description attributes that are documented in the IPP Driver Replacement Extensions v2.0 (NODRIVER). This provide pretty much the same information mapped from the SNMP Printer MIB without the "low" values.