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Recently I tried to run gnome-shell on wayland (Fedora 27) with mesa-18.0.0-rc2. I wasn’t able to perform a single mouse click. Eventually I bisected this bug to a certain commit in mesa. After I filed a bug in the freedesktop bugzilla, I learned that it’s not a mesa bug. Instead it’s a bug in gnome-shell or one of its dependencies. This also applies for GDM.

see: https://bugs.freedesktop.org/show_bug.cgi?id=104808

In a commit message of Mario Kleiner I found a great explanation: https://patchwork.freedesktop.org/patch/175106/

Workaround:

.drirc:

<driconf> <device screen="0" driver="radeonsi"> <application name="gnome-shell"> <option name="allow_rgb10_configs" value="false" /> </application> </device> </driconf>

/etc/drirc:

<driconf> <device driver="radeonsi"> <application name="gdm"> <option name="allow_rgb10_configs" value="false" /> </application> </device> </driconf>