0aa4bab539
When using its EGLStream-based presentation path with the proprietary NVIDIA driver, mutter will use a different function to process page flips - custom_egl_stream_page_flip. If that fails due to an EBUSY error, it will attempt to retry the flip. However, when retrying, it unconditionally uses the libdrm-based path. In practice, this causes a segfault when attempting to access plane_assignments->fb_id, since plane_assignments will be NULL in the EGLStream case. The issue can be reproduced reliably by VT-switching away from GNOME and back again while an EGL application is running. This patch has mutter also use the custom page flip function when retrying the failed flip. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1375
Mutter
Mutter is a Wayland display server and X11 window manager and compositor library.
When used as a Wayland display server, it runs on top of KMS and libinput. It implements the compositor side of the Wayland core protocol as well as various protocol extensions. It also has functionality related to running X11 applications using Xwayland.
When used on top of Xorg it acts as a X11 window manager and compositing manager.
It contains functionality related to, among other things, window management, window compositing, focus tracking, workspace management, keybindings and monitor configuration.
Internally it uses a fork of Cogl, a hardware acceleration abstraction library used to simplify usage of OpenGL pipelines, as well as a fork af Clutter, a scene graph and user interface toolkit.
Mutter is used by, for example, GNOME Shell, the GNOME core user interface, and by Gala, elementary OS's window manager. It can also be run standalone, using the command "mutter", but just running plain mutter is only intended for debugging purposes.
Contributing
To contribute, open merge requests at https://gitlab.gnome.org/GNOME/mutter.
The coding style used is primarily the GNU flavor of the GNOME coding
style
with some minor additions such as preferring stdint.h types over GLib
fundamental types, and a soft 80 character line limit. However, in general,
look at the file you're editing for inspiration.
Commit messages should follow the GNOME commit message guidelines. We require an URL to either an issue or a merge request in each commit.
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.