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Hi, I installed xorg-x11. (because i wanted x11-wm/i3). xorg-x11 depends on xbacklight. My problem was that xbacklight didn't work because of an error: $ xbacklight -get No outputs have backlight property So, searching on the internet, I found this package: sys-power/acpilight, which works perfectly. From https://github.com/wavexx/acpilight : So, in the end, all I did was: $ emerge --unmerge xbacklight $ emerge acpilight Now, I can perfectly use my i3 WM, change brightness... without any issues. The only problem is that i can't update my system anymore. Since xorg-x11 (which is still installed) depends on xbacklight, when I try to update the system I got: $ sudo emerge -auvDN @world These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild N ] x11-apps/xbacklight-1.2.1-r1::xorg-kit 0 KiB [blocks B ] x11-apps/xbacklight ("x11-apps/xbacklight" is blocking sys-power/acpilight-1.0-r1) Total: 1 package (1 new), Size of downloads: 0 KiB Conflict: 1 block (1 unsatisfied) * Error: The above package list contains packages which cannot be * installed at the same time on the same system. x11-apps/xbacklight-1.2.1-r1:0/0::xorg-kit, ebuild scheduled for merge pulled in by x11-apps/xbacklight required by x11-base/xorg-x11-7.4-r2:0/0::xorg-kit, installed sys-power/acpilight-1.0-r1:0/0::nokit, installed pulled in by sys-power/acpilight required by @selected Is there a way to keep xorg-x11 and acpilight, maybe masking xbacklight ? What is the right way to do it?