=x11-libs/libdrm-2.4.28 has released on December 5th, 2011 Reproducible: Always
A problem has been found in 2.4.28. It might require a backport of the patch. https://bugs.freedesktop.org/show_bug.cgi?id=43538
(In reply to comment #1) > A problem has been found in 2.4.28. It might require a backport of the patch. > https://bugs.freedesktop.org/show_bug.cgi?id=43538 Well, that's the risk you're taking with using bleeding-edge software. ;-)
You can find libdrm-2.4.28 in the x11 overlay now. VIDEO_CARDS="radeon" has been dropped in this release as it won't build.
libdrm-2.4.29 has been released with the radeon problem fixed, so 2.4.28 will not be added to portage.