Now sys-power/upower-0.9.20-r2 is marked stable, it has "deprecated" and "systemd" USE flags, also usage of pm-utils is marked deprecated: $ bzcat /usr/share/doc/upower-0.9.20-r2/NEWS.bz2|head -n7 Version 0.9.20 ~~~~~~~~~~~~~~ Released: 2013-03-18 New Features: - Add a --enable-deprecated configure argument to remove pm-utils support (Richard Hughes) - Deprecate running the powersave scripts (Richard Hughes) pm-utils seems obsolete, there were no commits several years, latest commit: http://cgit.freedesktop.org/pm-utils/commit/?h=pm-utils-1.4&id=67abbd2f5109a732ab967c94bef4d6d9b2a11541 As i understand, current kde related ebuild should have 'sys-power/upower[deprecated]' in RDEPEND, but what about supporting 'sys-power/upower[-deprecated,systemd]'? Do you know about kde upstream plans for pm-utils and systemd?
This bug is, plainly speaking, unnecessary. upower has REQUIRED_USE="kernel_linux? ( !deprecated? ( systemd ) )" Meaning, if deprecated is disabled, systemd has to be enabled. Both "deprecated -systemd" and "-deprecated systemd" should provide what KDE needs. So there's absolutely no need to specify use dependencies anywhere.
Did you verify, that kde-4.10.1 builds fine with upower[-deprecated,systemd]? Did you check, that it reboots and suspends to ram without any problem?