Closed Bug 282109 Opened 16 years ago Closed 13 years ago

With xcompmgr running (X composite extension manager), autoscroll results in rendering errors on pages that do NOT contain iframes.


(Core :: General, defect)

Not set





(Reporter: dorrin, Unassigned)




(1 file)

755 bytes, application/zip
User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0

When using a version of the X server (and possibly Xephyr) with the X
composite extension enabled, running "xcompmgr" with any arguments can result in
rendering errors when using the autoscroll feature. This only occurs on pages
not containing iframes and on images. If the page contains the <iframe>
directive anywhere on it, the error does not occur.

Reproducible: Always

Steps to Reproduce:
1. Run a recent version of a Composite-enabled X server
2. Run xcompmgr
3. Use Firefox's autoscrolling feature on a page that contains no iframes

Actual Results:  
"Ghosting" of the autoscroll overlay image.

Expected Results:  
Not ghost the autoscroll image.

I was unable to test this bug with Mozilla, since the autoscroll extension would
not install.
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The latest beta releases can be obtained from:
I am still getting this bug on Deer Park 2. Again, if I included an <iframe> in
the page through Greasemonkey (or saving the page to harddisk and editing the
source), the problem disappeared.
Attached file Test cases
This zipfile contains a page with the bug, and a page without the bug
(broken.html and notbroken.html, respectively).
I can confirm this bug - when I enable composite in my xorg.conf I experience this bug and it works fine if I disable it.
Depends on: 263686
I see the same.

Note that the xorg people seem to think that this is a firefox bug. Also seems to suggest the same. IMHO, that is a dupplicate of this bug.


My System setup is:
1.  Gentoo Linux 2006.1
2.  Gnome Desktop Environment 2.16.1
3.  Beryl 0.2 beta composite window manager
4.  Firefox version Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20070115 BonEcho/

Steps I took to produce this bug:
1.  System started with aforementioned software running.
2.  In firefox, visit
3.  Scroll down, then scroll back up.  The pink header will "ghost" across the page obscuring sections of the webpage.

Steps I took to work around this bug:
1.  Terminate Beryl composite window manger.
2.  Start Metacity window manager (no composite manager)
3.  Revisit webpage from previous step #2 and scrolling works without the "ghosting".
Assignee: bross2 → nobody
Product: Firefox → Core
QA Contact: general → general
This happens on my system too...

Gecko/20070601 Ubuntu/7.10 (gutsy) Firefox/

For an example:

scroll upward will give the ghost result
Is this a duplicate of #263686?
this bug has been raised countless times, here's what the devs from freedesktop suggest,

besides the bug I opened, all the devs started blaming nvidia in a childish way,

..."This is an nvidia bug and their are blame us for their incompetence"...

if disabling the autoscroll is the best option yet, why not whiping out the autoscroll entirely.??

Maybe switching the format of the autoscroll images to another one that supports transparencies. PNG?
It definitely isn't (only) an NVidia bug because it happens on ATI cards too. What format are the attachments on that page supposed to be? They just appear as unidentifiable binary stuff.
hi thanks a lot for your answer, you can open that attachments with a text editor, (not quite sure what you meant with unidentiable binary stuff).
That's a workaround only for the GNOME/desktop, that sets proper window types and sizes, it's done through the gconf-editor, but it's still doesn't solves the lagging/artifacts of the autoscrolling icon itself, while it does suffice for other odd bugs.
I've been following up the threads over there on FF, which are very frequent.
I'm quite sure if someone takes on from here and investigates/asks over freedesktop,  you'll do them like a favor.
Now I'm thinking myself to start on YAW!!...(yet another workaround)
Duplicate of this bug: 368029
This bug has been fixed in 3.0, where the autoscroll image was moved out of the DOM (see bug #242621).
Closed: 13 years ago
Resolution: --- → FIXED
Depends on: 242621
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