I have no idea if Unity 8 has some blame in this, so not marking it as affected.
** Attachment added: "unity8.log" https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1501346/+attachment/4479985/+files/unity8.log ** Summary changed: - Gimp fails to start w/ Xmir running in '-rootless -flatten' mode in Unity 8 + Gimp fails to start w/ Xmir running in '-rootless -flatten' mode under Unity 8 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1501346 Title: Gimp fails to start w/ Xmir running in '-rootless -flatten' mode under Unity 8 Status in xorg-server package in Ubuntu: New Bug description: I'm trying to run Gimp in a Vivid + overlay PPA Unity 8 desktop session using Xmir from the overlay PPA with the '-rootless -flatten' Xmir options. Gimp fails to start in this situation. I've attached the application and unity8 log files. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1501346/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

