As discussed in https://gitlab.freedesktop.org/libinput/libinput/-/issues/521, it adds a narrower
match that only applies to X240. Other laptops that match `pvrThinkPad??40` are not affected:
$ systemd-hwdb query 'evdev:name:SynPS/2 Synaptics TouchPad:dmi:*svnLENOVO*:pvrThinkPadX240:*'
EVDEV_ABS_00=1232:5711:51
EVDEV_ABS_01=1159:4700:53
EVDEV_ABS_35=1232:5711:51
EVDEV_ABS_36=1159:4700:53
$ systemd-hwdb query 'evdev:name:SynPS/2 Synaptics TouchPad:dmi:*svnLENOVO*:pvrThinkPadX140:*'
EVDEV_ABS_00=::41
EVDEV_ABS_01=::37
EVDEV_ABS_35=::41
EVDEV_ABS_36=::37
This makes use of the developer mode switch: the test is only done
if the user opted-in into developer mode.
Before the man/update-dbus-docs was using the argument form where
we don't need to run find_command(), but that doesn't work with test(),,
so find_command() is used and we get one more line in the config log.
There is little point in #defining and #undefining CAP_LAST_CAP multiple times.
The check is only done in developer mode. After all, it's not an error to
compile on a newer kernel, and we shouldn't even warn in that case.
We have four legal cases:
1. /usr/lib/os-release exists and /etc/os-release is a symlink to it
2. both exist but /etc/os-release is not a symlink to /usr/lib/os-release
3. only /usr/lib/os-release exists
4. only /etc/os-release exists
The generic setup code in test-functions and create-busybox-image didn't handle
case 3.
The test-specific code in TEST-50 didn't handle 2 (because the general setup
code would only install /etc/os-release in the image and
grep -f /usr/lib/os-release would not work) and 4 (same reason) and would fail
in case 3 in generic setup.
