Stefan Monnier wrote:
> My guess is that it's a bug in the X11 acceleration code for your
> graphics card.  At least, that was the conclusion the last time this
> came up, IIRC.

FWIW, my X11 graphics card driver is 'intel' and my card is an 'Intel
945 GME'.

What about an Emacs workaround: redraw the mode-line after any scroll
operation? :-P

-- 
 ,= ,-_-. =.  Bruno Félix Rezende Ribeiro (oitofelix) [0x28D618AF]
((_/)o o(\_)) There is no system but GNU;
 `-'(. .)`-'  GNU Linux-Libre is one of its official kernels;
     \_/      All software must be free as in freedom;