| Summary: | Pointer barrier leak with multiple monitors | ||
|---|---|---|---|
| Product: | xorg | Reporter: | Owen Taylor <otaylor> |
| Component: | Server/General | Assignee: | Peter Hutterer <peter.hutterer> |
| Status: | RESOLVED WONTFIX | QA Contact: | Xorg Project Team <xorg-team> |
| Severity: | normal | ||
| Priority: | medium | CC: | jstpierre, peter.hutterer |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | 2012BRB_Reviewed | ||
| i915 platform: | i915 features: | ||
Reproduced, but the conditions are narrow. The barrier must align with the edge of a monitor and the movement _vector_ must not overlap with the barrier.
e.g. if you're in that corner, moving by 1/1 will block, moving by 1/2 won't block.
Cause is that the fixes code that calculates whether a barrier is blocking doesn't know about screen edges. So the picture the fixes code sees for a movement a to b is
a X
\X
\
b
Which is permitted since the movement goes just past the barrier. The RandR
code to clamp to monitors sees this picture:
+----------------+---------------------+
| | |
| | |
| | |
| a | |
+---------------\+ |
\ |
|b |
+---------------------+
Which too is allowed since the destination exists in RandR space. The two
operations are quite separated in the server, merging them is tricky.
As a workaround for now, I suggest either extending the barrier to the bottom of the second monitor like this:
+----------------+---------------------+
| | |
| | |
| | |
| X |
+----------------X |
X |
X |
X---------------------+
or, alternatively, to create a horizontal barrier in that corner that shares
the same endpoint with the vertical one.
This is a mass change of bugs. Bugs assigned to me that haven't been updated in the last 3 years are closed as WONTFIX, because, well, let's at least be honest about it. Please do not re-open unless you have a really good reason to do so (e.g. you're fixing it yourself). If it hasn't been fixed in the last 3 years, it probably won't be fixed anytime soon either. Sorry. |
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Given two monitors of unequal size +----------------+---------------------+ | | | | | | | | | | X | +----------------X | | | | | +---------------------+ And a pointer barrier at the location labelled X, its possible to mouse underneath the barrier from left to right and onto the second monitor. Reproduced with xorg-x11-server-Xorg-1.12.0-2.fc17.x86_64 (Using GNOME 3 you can reproduce by setting up two monitors like this with the primary monitor on the left - a pointer barrier will be set up at position X to make the hot corner at the bottom left. Try mousing along the bottom row of pixels on the left monitor. This leak is not observed if the two monitors are the same size, indicating that the pointer barrier is correctly positioned.)