Public bug reported:
Binary package hint: nvidia-glx-177
In a nutshell: garbled Emacs display when running under compiz with
nvidia drivers.
More precisely: when Emacs (running in its own X11 window) attempts to
refresh the window (e.g., when scrolling up or down a page, jumping to
top, control-L or something), it often happens that only the upper
portion of the window is refreshed. This also sometimes happens with
gnome-terminal (typically when scrolling), but much less reproducibly.
With Emacs, it occurs so frequently that it makes the editor almost
unusable.
Software & hardware config summary:
Ubuntu 8.10 Intrepid
Kernel 2.6.27-9-generic
x86-64 system (with 64-bit userland) on a Core 2 Duo
nVidia driver version 177.80 OR 177.82 OR 180.08 (I tried all three)
nVidia Quadro NVS 290 rev 161 graphics card
compiz 1:0.7.8-0ubuntu4.1
Pretty much any Emacs (emacs22-x, emacs22-gtk, emacs-snapshot-gtk)
To reproduce: launch Emacs, in its own window, on some text file (of
more than one page), with the compiz window manager running; jump to the
bottom of the file (M-<), and then then to the top (M->) or refresh the
screen (C-l): quite often, only the upper portion of the window is
refreshed, not the bottom, with the limit not necessarily along a line
boundary. Only the display is affected: jumping to a different
workspace and back will redraw the window correctly.
The bug does not occur with metacity, so it's probably composite-
related.
Probably nVidia's fault, because I couldn't produce a similar effect
with an Intel 945GME with the X.org/intel driver (and 32-bit but
otherwise similar software config). I sent a bug report of similar
content to the nVidia team (aka /dev/null).
I tried removing --lose-bindings from the compiz options, and disabling
DamageEvents in the xorg.conf, neither seemed to have any effect.
Ubuntu bug #269904 (similar problem affecting Firefox &al) is possibly
related to this, but _not identical_ (because the latter bug has a
workaround which does not help for this one). Although it's hard to
tell since the bug report has been much polluted.
On the other hand, Ubuntu bug #239917 is _not_ related (at least the
main part of it is not; the bug I describe is perhaps alluded to).
** Affects: nvidia-graphics-drivers-177 (Ubuntu)
Importance: Undecided
Status: New
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garbled Emacs display when running under compiz with nvidia drivers
https://bugs.launchpad.net/bugs/303224
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