Nouveau - Nov 2009 - [Bug 25036] New: KMS + multihead leaves ghost mouse pointer

http://bugs.freedesktop.org/show_bug.cgi?id=25036

           Summary: KMS + multihead leaves ghost mouse pointer
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
               URL: http://bbs.archlinux.org/viewtopic.php?id=83925
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: ataraxia937 at gmail.com
         QAContact: xorg-team at lists.x.org


I'm running a November 1st snapshot build of both the DDX and DRM modules,
as
provided by Arch Linux. Hardware is a GeForce 9400 GT. There are two monitors
attached, configured via RandR. I don't have any options set in xorg.conf
other
than the RandR setup.

When I move my mouse from one screen to the other, a "ghost pointer"
is left
behind in the last place on the now-inactive screen that the pointer was drawn.
It remains there until I enter that screen again. While it is there, the cursor
glyph updates in sync with the "real" pointer on the active screen.

If I move the mouse slowly enough that the cursor visually reaches the edge of
the screen before I cross to the other screen, the ghost won't appear until
the
glyph changes, at which point the ghost suddenly appears, mapped on the
edgemost column of the screen. It then remains there and behaves just as in the
previous case.

There are no interesting log messages from either the DDX or the DRM.

This bug only occurs with KMS enabled.

This resembles bug 12471, except that there, the ghost is always in the
top-left corner.

The URL attached to this bug is to a thread on the Arch Forums describing this
bug.


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--- Comment #1 from Francis Galiegue <fgaliegue at gmail.com>  2010-01-18
07:14:06 PST ---
I confirm the bug, I observe the same here. My card is reported as such by
lspci:

01:00.0 VGA compatible controller: nVidia Corporation G86 [GeForce 8500 GT]
(rev a1)

(lspci reports: 01:00.0 0300: 10de:0421 (rev a1))

I use git libdrm and xf86-video-nouveau. This is a Gentoo unstable amd64
machine.

I boot with drm.debug=6 and I notice that there is a sequence of calls as this:


* nv50_cursor_set_offset;
* nv50_cursor_show;
* this last sequence repeated many times;
* then nv50_cursor_hide.

But when the bug appears, the nv50_cursor_hide show is nowhere to be seen.


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--- Comment #2 from Francis Galiegue <fgaliegue at gmail.com>  2010-01-19
02:09:42 PST ---
I should also comment that the bug only appears when there's some sort of
cursor state change, which happens pretty much every time you change widget in
a window.

That is, it will not appear if you have no window displayed and just move the
cursor between the different desktops.

The kernel messages I mentioned above appear pretty much every time I cross
window borders, enter/exit a text editing area, etc etc.


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--- Comment #3 from ataraxia937 at gmail.com  2010-02-18 19:17:52 PST ---
This is fixed for me as now.


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--- Comment #4 from a.radke at arcor.de  2010-02-19 01:33:03 PST ---
what change/update fixed it for you? I'm still having the cursor hanging on
the
screen border. mostly when I move the mouse quickly. it doesn't happen when
I
move the mouse slowly.


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--- Comment #5 from ataraxia937 at gmail.com  2010-02-19 06:06:44 PST ---
I don't know what change fixed it, as I haven't been tracking it, and
haven't
done a bisect either. I've been using your [extra] packages until now. Not
surprisingly, moving libdrm 2.4.18-2 and reverting to your nouveau packages
makes the bug show again. I'm content to wait for the next [extra] update
(which I expect will be after kernel 2.6.33).

(Upstream folks, sorry about the Arch-specific spam here...)


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--- Comment #6 from Xavier <shiningxc at gmail.com>  2010-02-19 06:49:41
PST ---
16:10 < shining> iirc curro_ said the pointer/cursor bugs would be fixed
by
this :
http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/commit/?id=0917665d1f2f1e76b6a0e7a4c027512f9f45f41b
16:15 < curro_> yeah that fixed it


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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #7 from Marcin Slusarz <marcin.slusarz at gmail.com>
2011-03-07 09:52:33 PST ---
It seems to be fixed, so I'm closing this bug report.

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