OK, here's a quick workaround for Xmir to get things going:
https://git.launchpad.net/~xmir-team/xorg-server/+git/xmir/commit/?id=18ee4ec59c1ab47c857205d6abbcdc5881ec2f9b
It's a workaround and not a fix because a proper fix will have to occur
in Mir itself. Mir's "system compositor" mode needs to be enhanced to
not reject surfaces that don't select and fit a physical display. So
this will only work with a single monitor. And it will only work after
we figure out this USC issue: bug 1548210
Once Mir gets fixed, the workaround in Xmir should be reverted. And
theoretically we could then have multi-monitor Xmir inside Mir.
** Changed in: xorg-server (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1536815
Title:
Connecting Xmir to USC fails [std::exception::what: An output ID must
be specified from
src/server/shell/system_compositor_window_manager.cpp(66)]
Status in Mir:
New
Status in xorg-server package in Ubuntu:
Fix Committed
Bug description:
As seen here https://unity.ubuntu.com/mir/using_mir_on_pc.html
I should be able to install ubuntu-desktop-mir and run unity7, but
instead I receive the following error:
failed to create a surface: Error processing request: An output ID must be
specified
Internal error details:
/build/mir-1tnxlh/mir-0.18.1+16.04.20160115/src/server/shell/system_compositor_window_manager.cpp(66):
Throw in function virtual mir::frontend::SurfaceId
mir::shell::SystemCompositorWindowManager::add_surface(const
std::shared_ptr<mir::scene::Session>&, const
mir::scene::SurfaceCreationParameters&, const
std::function<mir::IntWrapper<mir::frontend::detail::SessionsSurfaceIdTag>(const
std::shared_ptr<mir::scene::Session>&, const
mir::scene::SurfaceCreationParameters&)>&)
Dynamic exception type:
boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error>
>
std::exception::what: An output ID must be specified
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