udisks uses "iocharset=utf8" in default mount options for iso9660 and udf filesystems. This causes the mount to fail when the kernel does not have CONFIG_NLS_UTF8 set (either y or m is fine). The failure occurs with KDE and nautilus, and the configuration incompatibility is not obvious. See for example http://forums.gentoo.org/viewtopic-t-914632-start-0.html The error message includes "bad option" as a possible cause of the failure, but this is not so helpful as the user is not aware of the iocharset option being used. Reproducible: Always
seems to be valid for both slots too + 10 Jul 2012; Samuli Suominen <ssuominen@gentoo.org> udisks-1.0.4-r2.ebuild, + udisks-1.98.0.ebuild: + Warn users if CONFIG_NLS_UTF8=y is missing wrt #425562 by Karl Tomlinson