These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] x11-libs/xcb-util-0.4.1::gentoo  262 KiB
[ebuild  N     ] x11-apps/xbacklight-1.2.4::gentoo  119 KiB

Total: 2 packages (2 new), Size of downloads: 380 KiB