emerging X on a Pismo powerbook (with Rage128 mobility video) yields display problems in some applications (notably vnc and mplayer). Google searches seem to point at this being an endianness issue in the r128 driver, but other PPC distros like Debian seem to have corrected it. Specifically, launching mplayer in gui mode or playing videos shows the display area with a distinctive yellow tint; likewise running a vnc server off the laptop (either plain vnc or tightvnc) shows the same yellow tint.
Xine is also affected; perhaps it's related to using the Xv video driver.
Would be interesting to see if this is fixed with the new (-r11) release of xfree. The old one had incorrect compiler options for ppc (hence the mouse-up problem). Perhaps this is the problem here too?
I would think this is a kernel DRI issue rather than an xfree issue, I may be wrong though (the kernel r128 DRI drivers are far from perfected ATM)