[Bug 31972] New: Screen focus switching confused after resolution change

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31972

           Summary: Screen focus switching confused after resolution
                    change
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: blade at debian.org
         QAContact: xorg-team at lists.x.org


Hello,

currently I am using a multi-monitor setup with a second VGA monitor attached
to onboard GPU. I found some problem with screen focus switching happening
after changing the resolution. Not sure it's a radeon problem or a general one,
please reassign as needed. Distro used: Debian Sid plus xorg from Experimental, 
xserver-xorg-video-radeon 1:6.13.2-1  X.Org X server -- AMD/ATI Radeon display
driver.

Scenario one:
Start X with the second screen having a low resolution (like XGA on a SXGA
monitor). Screen focus changes when the cursor reaches the border. Now change
the resolution of display :0.1 with xrandr to the higher resolution.
What happens? When you try to move the cursor from :0.1 to :0.0 it does nothing
for a while while the mouse is moving, and it suddenly jumps to almost the
center of the area. IMO the distance is the difference between the width of
original and current resolution.

Especially the part with "while the mouse is moving" is very inconvinient,
because if you ever touched one of the borders while moving the cursor around,
it feels like it just disappeared and something is broken (mouse battery
empty?!).

Scenario two:
Like above but start X with the optimal resolution on both screens. Now set a
lower resolution on the secondary screen with xrandr. Result: the second screen
is no longer reachable! Focus switching stops working, totally. Now use
"DISPLAY=:0.1 xrandr --output VGA-0 --auto", the resolution changes back and
now focus changing works again.

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