emacs window update artefacts

[Pauli Virtanen]

Binary package hint: compiz

Emacs window is redrawn only partially when scrolling. Ubuntu Intrepid, Nvidia GeForce 7600GS.

To reproduce: open a long file in emacs22, and scroll rapidly with the mouse wheel or the PgUp/PgDown keys. Notice that at some times not all of the window is redrawn and old contents are left behind.

This bug does not occur under Metacity, even when Metacity's compositing is turned on. So I believe it's most likely a compiz bug and not a bug in X or the video drivers.

ii nvidia-glx-177 177.13-0ubuntu8
ii compiz 1:0.7.7+git20080807-0ubuntu2
ii xserver-xorg 1:7.4~1ubuntu1
ii emacs22 22.2-0ubuntu1

Compiz .config/compiz/compizconfig/Default.ini configuration & a screenshot of the problem attached.

[Pauli Virtanen (pauli-virtanen)]

A picture of garbling of window contents due to scrolling a file containing C code with the mouse wheel.

Note that this problem makes Emacs unusable under Compiz.

[Pauli Virtanen (pauli-virtanen)]

Similar problem occurs in GVim: incomplete redraws when scrolling a file with PgUp/PgDown. In gvim, however, white rectangles appear instead of garbled text. Screenshot of the problem attached.

ii vim-gnome 1:7.1.314-3ubuntu3

[Ben Aisen (beinsane11)]

Confirmed with emacs-snapshot (regardless of font backend used).

[Anders Kaseorg (andersk)]

Confirmed on intrepid amd64 with a clean account (emacs-snapshot 20080727-1, compiz 0.7.7+git20080807-0ubuntu2, GeForce Go 7300 with nvidia driver 177.13-0ubuntu8).

[Ben Aisen (beinsane11)]

Fixed in compiz 1:0.7.7+git20080807-0ubuntu4.

[Anders Kaseorg (andersk)]

The major problems seem to be gone with compiz 0.7.7+git20080807-0ubuntu4; however, I still see some minor glitches like this:
http://web.mit.edu/andersk/Public/emacs-corruption.png
Is anyone else seeing this?