| Summary: | XTestFakeMotionEvent no longer works on multiple screen displays | ||
|---|---|---|---|
| Product: | xorg | Reporter: | Karl Runge <runge> |
| Component: | Server/General | Assignee: | Xorg Project Team <xorg-team> |
| Status: | RESOLVED MOVED | QA Contact: | Xorg Project Team <xorg-team> |
| Severity: | major | ||
| Priority: | medium | CC: | antoine |
| Version: | unspecified | Keywords: | regression |
| Hardware: | All | ||
| OS: | All | ||
| Whiteboard: | 2011BRB_Reviewed | ||
| i915 platform: | i915 features: | ||
Can you bisect it further than "in the 2009 time frame"? Even version deltas would be more helpful in narrowing down the regression (In reply to comment #1) > Can you bisect it further than "in the 2009 time frame"? Even version deltas > would be more helpful in narrowing down the regression Unfortunately, I'm not able to build Xorg any more, so I can only give you some field reports. I have an old lenny machine and XTestFakeEventMotion works properly on: # /usr/bin/Xorg -version X.Org X Server 1.4.2 Release Date: 11 June 2008 X Protocol Version 11, Revision 0 Build Operating System: Linux Debian (xorg-server 2:1.4.2-10.lenny3) Current Operating System: Linux corvus 2.6.26-2-686 #1 SMP Sat Jun 11 14:54:10 U TC 2011 i686 Build Date: 25 September 2010 12:05:44PM I can't find a good upper bound with machines I have access to. I think this post does a better job than I can: https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/339783 That at least gives a date (Apr 24 2009) and an Ubuntu release, so I think one could map that into Xorg version numbers. I have Ubuntu 9.04 on a test machine. I booted it and verified that the XTestFakeMotionEvent bug reported here does occur for the following version of Xorg: X.Org X Server 1.6.0 Release Date: 2009-2-25 X Protocol Version 11, Revision 0 Build Operating System: Linux 2.6.24-23-server i686 Ubuntu Current Operating System: Linux fred-desktop 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 i686 Build Date: 09 April 2009 02:10:02AM xorg-server 2:1.6.0-0ubuntu14 (buildd@rothera.buildd) Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. This bug is still present in the latest Xorg versions.
The code in ProcXTestFakeInput gets the screen using miPointerGetScreen.
for (i = 0; i < nevents; i++)
mieqProcessDeviceEvent(dev, &xtest_evlist[i], miPointerGetScreen(inputInfo.pointer));
But it should honour the screen set in the request instead, and only use miPointerGetScreen when the screen value is negative.
I've tested this by hard-coding the screen to the value:
screen = screenInfo.screens[1];
And as expected, all events are sent to the second screen.
What is the proper way of fixing this?
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It appears that sometime in the 2009 time frame the XTEST interface: XTestFakeMotionEvent(dpy, screen, x, y, delay) on a multiple screen display stopped flipping to the one specified by the screen argument. The current behavior is that it stays on the screen that has the current focus and does the motion there (i.e. as though screen = -1 were specified.) The following program can be used on a multiple screen display to reproduce the problem: /* cc -o flip_screens flip_screens.c -L /usr/X11R6/lib -lX11 -lXtst */ #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <X11/Xlib.h> #include <X11/Xutil.h> #include <X11/extensions/XTest.h> int main() { int i, s; Display *dpy = XOpenDisplay(NULL); if (!dpy) { printf("XOpenDisplay failed.\n"); return 1; } for (i=0; i < 10; i++) { for (s=0; s < 2; s++) { int n = 200+10*i; printf("flipping to screen: %d ...\n", s); XTestFakeMotionEvent(dpy, s, n, n, CurrentTime); XFlush(dpy); sleep(1); } } XCloseDisplay(dpy); return 0; }