[Bug 237642] x11-drivers/xf86-video-ati: Upgrade from 18.1.0 to 19.0.0 results in invisible mouse pointer

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237642

--- Comment #33 from Alexey Dokuchaev <danfe at FreeBSD.org> ---
(In reply to Niclas Zeising from comment #30)
> So, what the code probably should do, on FreeBSD, is
> if (ret == -1 && errno == -EINVAL) maybe.
Not just on FreeBSD.  This is correct POSIX semantics (modulo the errno
negation).  Linux' ioctl(2) manpage says that "a few ioctl() requests use the
return value as an output parameter and return a nonnegative value on success"
but that's utterly broken.  Ideally, drmIoctl() should be fixed to always
behave per POSIX.

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