As I've found now the origin of '/etc/udev/rules.d/79-udev-epson.rules'
- it was installed by the epson-printer-utility for my Epson XP 540 - I
tried what happens when I switch to a more 'common' udev rule.
I tried (similiar to the rule for brother scanners provided by Hans):
ATTRS{idVendor}=="04b8", ATTRS{idProduct}=="*", MODE="0664",
GROUP="scanner", ENV{libsane_matched}="yes"
Result: No firmware up-load, no scanner found. As soon as a I switch
back to the rule installed by epson the scanner starts (after switching
off-on) to up-load the firmware and is accessible by scanning programs
(as non-root).
@luca
can you please try the following udev rule (scanner is locally attached
via usb, please keep the current one stored at an other place, no
garantuee, so you may want to revert) :
/etc/udev/rules.d/79-udev-brother.rules
# chmod device BROTHER group
ATTRS{manufacturer}=="BROTHER", DRIVERS=="usb", SUBSYSTEMS=="usb",
ATTRS{idVendor}=="04f9", ATTRS{idProduct}=="*", MODE="0777"
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https://bugs.launchpad.net/bugs/1728012
Title:
Many 3rd party scanner drivers are broken by a sane change
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