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Now that we no longer propagate callback return values, we can safely call
into user-callbacks during sysview_context_stop(). This way, users can
rely on all objects to be removed via callbacks (except if they failed
during object creation). This avoids duplicating any object hashtables on
the users' side and reduces memory consumption.
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Instead of raising DEVICE_CHANGE only per device, we now raise it per
device-session attachment. This is what we want for all sysview users,
anyway, as sessions are meant to be independent of each other. Lets avoid
any external session iterators and just do that in sysview itself.
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Whenever a display is added or changed, we suppressed any frame events.
Make sure to raise them manually so we can avoid rendering when handling
anything but FRAME events.
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Properly forward DEVICE_CHANGE events into grdev so we can react to
changing display setups.
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The high frequency of the color-morphing is kinda irritating. Reduce it
to a much lower frequency so you can actually look at it longer than few
seconds.
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The systemd-modeset tool is meant to debug grdev issues. It simply
displays morphing colors on any found display. This is pretty handy to
look for tearing in the backends and debug hotplug issues.
Note that this tool requires systemd-logind to be compiled from git
(there're important fixes that haven't been released, yet).
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