If you turn the screen by 90 degrees and then turn it back to normal, a second cursor (rotated by 90 degrees as well) appears.

To reproduce:

xrandr --output <output> --rotate left

# do something, click a few buttons...

xrandr --output <output> --rotate normal

The attached screenshot shows the problem. (Sorry for the quality, capturing the cursor as well is apparently pretty hard to do , even with disabled hardware cursor)

Versions:

xorg-xrandr 1.4.2
xorg-server 1.16.0
xf86-video-intel 2.99.914

Link to the picture: http://www.image-share.com/ijpg-2643-6.html

Please try (xf86-video-intel):

diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
index 8964e77..eed68d3 100644
--- a/src/sna/sna_display.c
+++ b/src/sna/sna_display.c
@@ -4294,7 +4294,7 @@ static struct sna_cursor *__sna_get_cursor(struct sna *sna, xf86CrtcPtr crtc)
                image = sna->cursor.scratch;
                cursor->last_width = cursor->last_height = size;
        }
-       if (width < cursor->last_width || height < cursor->last_height)
+       if (width < cursor->last_width || height < cursor->last_height || rotation != cursor->rotation)
                memset(image, 0, 4*size*size);
        if (rotation == RR_Rotate_0) {
                if (argb == NULL) {

Well, I (manually) patched sna_display.c and recompiled the driver. As far as I can see the fix works. Thanks a lot for the quick response, I have never seen a bug fixed 5 hours after the initial report. Very impressive :)

commit a88795c64123e4084044451d8861838ea904abd9
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Tue Jul 29 21:11:09 2014 +0100

    sna: Clear cursor image after rotation
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81886
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

This bug still affects me.

Description:	Ubuntu 14.10
Linux Lenovo-G510 3.16.0-34-generic #45-Ubuntu SMP Mon Mar 23 17:21:27 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Yet the bug is fixed upstream.