I'm seeing similar corruption with tvbrowser, however I cant make it 'stick'. It corrupts only during the scrolling, and as mentioned, only when scolling sideways to the right. I do however see similar corruption a lot in other apps, that sticks until redraw. And it seems related to text rendering, not especially to scrolling. I suspect its the same issue as the corruption looks quite similar.

I see it most often in the bookmarks bar of Chromium, there it shows up usually after 1-2 hovers with the mouse pointer. Just make sure the bar is visible, and add some bookmarks there (with label). Sometimes gnome-terminal also corrupts, and for example the torrent list in Transmission. When I focus the window, the corruption disapears (until it corrupts again), probably gets redrawn?

AFAICT it is independent of compositing; it happens in gnome's fallback mode also, and xfce4 w/ compositing disabled.

Attaching a screen shot that shows both chromium and gnome-terminal corrupting.

Using the same xorg stack I see it on AMD Radeon HD4780, HD5450, HD5770 and HD6670, but not on Intel HD2000 (Sandy Bridge). Verified with kernel 3.0.x, 3.1.x and 3.2-rc5. No xorg.conf, no weird radeon module options.

The stack looks like this, its basicly pure builds from git, with xorg core from the 1.11 branch (xorg-edgers PPA on Ubuntu 11.10):
libdrm-dev                       2.4.28+git20111207.dd9a5b4f-0ubuntu0sarvatt~oneiric
libdrm-intel1                    2.4.28+git20111207.dd9a5b4f-0ubuntu0sarvatt~oneiric
libdrm-nouveau1a                 2.4.28+git20111207.dd9a5b4f-0ubuntu0sarvatt~oneiric
libdrm-radeon1                   2.4.28+git20111207.dd9a5b4f-0ubuntu0sarvatt~oneiric
libdrm2                          2.4.28+git20111207.dd9a5b4f-0ubuntu0sarvatt~oneiric
libegl1-mesa                     7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
libegl1-mesa-dev                 7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
libegl1-mesa-drivers             7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
libgbm1                          7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
libgl1-mesa-dev                  7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
libgl1-mesa-dri                  7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
libgl1-mesa-glx                  7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
libglapi-mesa                    7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
libglu1-mesa                     7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
libkms1                          2.4.28+git20111207.dd9a5b4f-0ubuntu0sarvatt~oneiric
libopenvg1-mesa                  7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
mesa-common-dev                  7.12.0~git20111209.eefff370-0ubuntu0sarvatt~oneiric
xserver-common                   2:1.11.2.902+git20111209+server-1.11-branch.0ca8869e-0ubuntu0sarvatt~oneiric
xserver-xorg-core                2:1.11.2.902+git20111209+server-1.11-branch.0ca8869e-0ubuntu0sarvatt~oneiric
xserver-xorg-input-evdev         1:2.6.99+git20111201.a9cdb659-0ubuntu0sarvatt~oneiric
xserver-xorg-input-mouse         1:1.7.1+git20111207.8bc8502c-0ubuntu0sarvatt~oneiric
xserver-xorg-input-vmmouse       1:12.7.0+git20111109.fd140bfb-0ubuntu0sarvatt2~oneiric
xserver-xorg-video-ati           1:6.14.99+git20111207.bc54e415-0ubuntu0sarvatt~oneiric
xserver-xorg-video-cirrus        1:1.3.2+git20110912.e4f80ffd-0ubuntu0sarvatt
xserver-xorg-video-fbdev         1:0.4.2+git20111109.a8721393-0ubuntu0sarvatt~oneiric
xserver-xorg-video-intel         2:2.17.0+git20111209.429a36f7-0ubuntu0sarvatt~oneiric
xserver-xorg-video-mach64        6.9.0+git20111109.0de23432-0ubuntu0sarvatt~oneiric
xserver-xorg-video-mga           1:1.4.13.dsfg+git20110928.07792ef4-0ubuntu0sarvatt
xserver-xorg-video-neomagic      1:1.2.5+git20111109.f2a771c6-0ubuntu0sarvatt~oneiric
xserver-xorg-video-nouveau       1:0.0.16+git20111207.3d2a752c-0ubuntu0sarvatt~oneiric
xserver-xorg-video-openchrome    1:0.2.904+svn920-1ubuntu0sarvatt
xserver-xorg-video-r128          6.8.1+git20111109.67aaa469-0ubuntu0sarvatt~oneiric
xserver-xorg-video-radeon        1:6.14.99+git20111207.bc54e415-0ubuntu0sarvatt~oneiric
xserver-xorg-video-s3            1:0.6.3+git20111109.381ace93-0ubuntu0sarvatt~oneiric
xserver-xorg-video-savage        1:2.3.3+git20111109.8b9c81ba-0ubuntu0sarvatt~oneiric
xserver-xorg-video-siliconmotion 1:1.7.5+git20111118.7d9c1a49-0ubuntu0sarvatt~oneiric
xserver-xorg-video-sis           1:0.10.3+git20110913.94f23a56+really0.10.3-0ubuntu0sarvatt
xserver-xorg-video-sisusb        1:0.9.4+git20111109.02451944-0ubuntu0sarvatt~oneiric
xserver-xorg-video-tdfx          1:1.4.3+git20111118.4ea96c22-0ubuntu0sarvatt~oneiric
xserver-xorg-video-trident       1:1.3.4+git20111109.6afbfaf6-0ubuntu0sarvatt~oneiric
xserver-xorg-video-vesa          1:2.3.0+git20111109.4ba7306f-0ubuntu0sarvatt~oneiric
xserver-xorg-video-vmware        1:11.0.99.901+git20111123.abf9cb75-0ubuntu0sarvatt~oneiric

Will try to run some more tests tomorrow.. Maybe narrow it down to a particular component and start bisecting it.