Comment 7 for bug 1863239
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| Till Kamppeter (till-kamppeter) wrote | #7 |
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0e1f616
(Get the code!)
There was already a measure against wrongly identifying HP printers as media players, but it is a rather dirty workaround which does not work any more (therefore this bug). The rule in the end of 69-libmtp.rules checks the absence of the env variable libsane_matched and this variable is set for all HP printers by HPLIP. First, this rule fails miserably if HPLIP is not installed, and I cannot imagine that the libmtp package depends on HPLIP only to identify unsupported devices. Also the libmtp rules are applied for both "add" and "bind" actions, whereas the rules of HPLIP (56-hpmud.rules) are only applied for "add" and so the bug happens on a "bind" action, here the HPLIP rules do not set said env variable and so the libmtp rules probe the HP printers.
One can theoretically work around this problem by mucking with the UDEV rules of HPLIP, but this is a REALLY DIRTY workaround, so please DO NOT add an hplip task to this bug report.
In addition, HPLIP will not be installed by default any more in the not too far future, as prnting and scanning will get snapped. Also we want printer driver Snaps (Printer Applications) not to run as root if possible, so we need to be sure that USB printer device files always belong to the group "lp" for all printer manufacturers and without HPLIP.