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Previously, we were waiting up to 300ms for the signal, then proceeding anyway. However, 300ms is not necessarily long enough to wait on an autobuilder that might be heavily loaded, particularly if it's a non-x86 with different performance characteristics. Conversely, if mutter responds to the D-Bus signal from the mock sensor before we have connected to the signal, then we cannot expect to receive the signal - it was already emitted, but we missed it. In this case, we need to avoid waiting. One remaining use of wait_for_orientation_changes() that would previously always have timed out was in meta_test_orientation_manager_has_accelerometer(), which does not actually expect to see an orientation-changed signal. Make this wait for the accelerometer to be detected instead. Resolves: https://gitlab.gnome.org/GNOME/mutter/-/issues/1967 Bug-Debian: https://bugs.debian.org/995929 Signed-off-by: Simon McVittie <smcv@debian.org> Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2049>