Bug 24856 - xorg-server-1.7.1 mouse cursor not moving from MouseKeys
Summary: xorg-server-1.7.1 mouse cursor not moving from MouseKeys
Alias: None
Product: xorg
Classification: Unclassified
Component: Server/Input/XKB (show other bugs)
Version: 7.4 (2008.09)
Hardware: x86 (IA32) All
: medium normal
Assignee: Daniel Stone
QA Contact: Xorg Project Team
Depends on:
Blocks: xserver-1.7.x xserver-1.9
  Show dependency treegraph
Reported: 2009-11-02 11:29 UTC by Harald van Dijk
Modified: 2010-07-14 21:04 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

xorg.conf (2.53 KB, text/plain)
2009-11-02 11:29 UTC, Harald van Dijk
no flags Details

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Description Harald van Dijk 2009-11-02 11:29:17 UTC
Created attachment 30922 [details]

When using xorg-server 1.7.1, and mouse keys, the cursor location is not updated on the screen unless the cursor is hidden and shown again (for example when typing in an xterm window, or moving it somewhere where the cursor changes). Except for Driver "vesa" instead of Driver "nv" for an already reported crash, my xorg.conf (attached) is unchanged from a working 1.6.5 setup.

To see this, I can start an X session, open an xterm window, maximize it, press Alt-Shift-NumLock, and try to move the mouse cursor with the arrow keys. Nothing seems to happen. I press 'a', and xterm hides the cursor. I press 4, and the cursor reappears at the correct location. I press 4 again, and the cursor doesn't move.

When moving the cursor using an actual mouse, the screen gets updated correctly.
Comment 1 Harald van Dijk 2009-12-22 11:01:27 UTC
With Driver "nv" back, now that the crash is fixed, the mouse cursor does move with mouse keys. It's only with vesa that it's not moving.

Unfortunately, nv is not usable even with the crash fixed, which I'll report separately later, so this bug is still an issue for me.
Comment 2 Alan Coopersmith 2010-01-06 16:15:32 UTC
I'm seeing this using the "nvidia" driver on OpenSolaris with Xorg 1.7.3.
(Which means silkenmouse is disabled.)

Stepping through the code with a debugger I can see it going through the
motions in XkbDDXFakePointerMotion(), which culminates in a call to
(*pScreen->SetCursorPosition).   That goes through a series of unwrappers
down to this call stack
    -> xf86WarpCursor()
     -> miPointerWarpCursor()
      -> miPointerMove()
       -> miPointerMoved()

At line 478 of mipointer.c, miPointerMoved() finally gets to the point where
it decides if it should update the sprite on screen, but finds that 
pScreenPriv->waitForUpdate is true, so it skips the update and move on.
waitForUpdate seems to be set in hw/xfree86/ramdac/xf86Cursor.c to be the
inverse of infoPtr->pScrn->silkenMouse.

If I change XkbDDXFakePointerMotion() to set pScreenPriv->waitForUpdate to
false, I get cursor updates as expected:

    if (pScreen->SetCursorPosition) {
	Bool  waitForUpdate;
	miPointerScreenPtr  pScreenPriv = GetScreenPrivate(pScreen);

	waitForUpdate = pScreenPriv->waitForUpdate;
	pScreenPriv->waitForUpdate = False;
	(*pScreen->SetCursorPosition)(inputInfo.pointer, pScreen, oldX, oldY, TRUE);
	pScreenPriv->waitForUpdate = waitForUpdate;

but that seems grotty.   It seems like most of XkbDDXFakePointerMotion()
should be replacable by something like miPointerMove() anyway, but I haven't
figured out how to do that.
Comment 3 Peter Hutterer 2010-04-13 18:38:23 UTC
This could be accidentally fixed by these patches: 
Comment 4 Alan Coopersmith 2010-05-12 17:47:12 UTC
(In reply to comment #3)
> This could be accidentally fixed by these patches: 
> http://lists.freedesktop.org/archives/xorg-devel/2010-April/007310.html

Unfortunately, it doesn't seem to be, as I can still reproduce on Xorg 1.8.1,
which contains those fixes.
Comment 5 Alan Coopersmith 2010-05-12 19:57:56 UTC
As noted in comment 2, this appears to be tied to the SilkenMouse state,
which is off by default on Solaris/OpenSolaris.   And indeed, I can
cause both Xorg 1.7.4 & 1.8.1 to start updating the cursor correctly
with MouseKeys via a simple xorg.conf setting of:

Section "ServerFlags"
        Option "UseSIGIO" "true"
        Option "SilkenMouse" "true"
Comment 6 Peter Hutterer 2010-07-14 21:04:24 UTC
Pretty sure this is fixed with

commit f0fcffe55f280add5e4db2f5e9198a48c6f1b015
Author: Alan Coopersmith <alan.coopersmith@oracle.com>
Date:   Thu Jun 3 19:00:54 2010 -0700

    Update the sprite immediately when moving it with MouseKeys

please reopen if the problem is still there.

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