In April I closed out ~100 bugs assigned to x11@ that the X11 team never had any realistic ability to fix ourselves (see most bugs about x11-drivers/ati-drivers). Most of these were fleeting driver bugs affecting a particular piece of hardware and a (often now old) particular version of the driver -- now long obsolete but still cluttering our bugzilla and making triaging actually solvable bugs more difficult.
We often direct reporters to file bugs upstream (being a middle-man for a driver bug is extremely inefficient), but even when that happens the Gentoo bug remains open, often long after the upstream bug is fixed and closed. Worse, users sometimes file bugs in our bugzilla that we don't have time to respond to for a while during which time they're waiting on people without the ability to help them. Is there a better way of directing reporters to file bugs upstream? Of course it's not always clear whether a bug is an ebuild bug or something easily patched in Gentoo vs a driver bug that requires an upstream developer... Maybe some text on https://bugs.gentoo.org/enter_bug.cgi asking users to direct bug reports upstream under some to-be-decided-upon circumstances?