Hazel Russman wrote:

I've done a few further experiments on this, including building and testing a 
LFS-7.7-systemd with a skeleton X desktop. There are really two different 
problems:

1) The spurious error messages at boot. These are associated with the rule
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", IMPORT{builtin}="usb_id", 
IMPORT{builtin}="hwdb --subsystem=usb"
   and can be prevented in systemd-udev-216 by bypassing this rule except for 
add events. In systemd-udev-217 they no longer occur at all. However in 
[e]udev-217 they do, and cannot be prevented by changing the rule.

2) The "evdev bug". This occurs only in [e]udev-217 and not in either of the 
two systemd-udevs. It is associated with the rule
SUBSYSTEM=="input", ENV{ID_INPUT}=="", IMPORT{builtin}="input_id"
If this rule is bypassed, xf86-input-evdev no longer works.

So it's a bug in eudev, probably in the usb_id builtin function, since this is 
called in both the problematic rules.

Maybe this should be reported upstream?

See https://github.com/gentoo/eudev/issues/110

  -- Bruce


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