I am experiencing the same issue, using a Thinkpad W520, on 16.04. Two external monitors are connected via DVI. On boot, all three monitors are mirrored, and correctly show the Ubuntu log. After logging in, I get the same error messages:
The selected configuration for displays could not be applied could not set the configuration for CRTC 64 and GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._gsd_2drr_2derror_2dquark.Code2: could not set the configuration for CRTC 64 One of the monitors is disabled. If I enable it using the Unity Settings app, the same error message show up. Tailing -f /var/log/Xorg.0.log while enabling the monitor reveals: [ 451.532] (II) intel(0): resizing framebuffer to 5440x1672 [ 451.582] Cannot do multiple crtcs without X server dirty tracking 2 interface [ 451.582] randr: failed to set shadow slave pixmap [ 451.582] (EE) NOUVEAU(G0): failed to set mode: No space left on device This appears to be the same bug as #1597437. It also seems to have been resolved in Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=1307204. ** Bug watch added: Red Hat Bugzilla #1307204 https://bugzilla.redhat.com/show_bug.cgi?id=1307204 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1556459 Title: [Lenovo ThinkPad W530] Regression: cannot set up 3 display configuration any more (Optimus) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1556459/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
