[Bug 253736] backlight(8) arg parsing can be tricked in a small way

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253736

David Schlachter <fbsd-bugzilla at schlachter.ca> changed:

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--- Comment #1 from David Schlachter <fbsd-bugzilla at schlachter.ca> ---
Appears to be by design, see line 199 of usr.bin/backlight/backlight.c:

    percent = percent == 0 ? 10 : percent;

If this behavior isn't changed to do nothing instead, it should maybe be
documented on the man page. I imagine the idea is to incr/decr by 10 only if no
percentage is provided, rather than to do this specifically given a percentage
of zero.

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