When application which uses GF library switches video mode in console to 800x600 (or 640x480), without photon, often 
1440x900 video mode is set instead of  800x600. display.conf still contains 800x600, like it must be. Photon also starts
 in the 1440x900 and I can see 1440x900 video in the video modes list like one of the available video modes. But when I 
will switch video mode resolution to 800x600 under photon, this magic mode 1440x900 is missed in the list.

I can't reproduce this bug under devg-radeon and devg-tnt, only on devg-extreme2, devg-i830, devg-gma9xx drivers.

6.4.0 contains this bug also, but it was not too annoying, while under 6.4.1 M4, it appears every third mode switch.