What are *expected* differences in kernel modesetting between F10 and rawhide?

[Michal Jaegermann]

I am asking because for me visually differences are substantial.

I am booting both on the same hardware (different partitions on the
same machine) using "ATI Technologies Inc R300 AD [Radeon 9500 Pro]"
video card.  Assume also that in both cases I do not have neither
'rhgb' nor 'nomodeset' in boot options.

When booting F10 at some moment a display will switch to a frame
buffer making fonts used by messages really small (and if 'rhgb'
is used I will see a full screen boot animation instead).

That does not happen with rawhide kernels.  Fonts always remain of
the same size as if 'nomodeset' was present.  OTOH if I will skip
that option then I can pretty much expect that on the next boot my
monitor will go crazy by loosing a vertical and/or horizontal sync.
Most likely this will happen when a grub menu is displayed, and then
a picture will start jumping all over the place, but a normal text
from BIOS may also get "shakes".  The only known cure is to power
down a monitor (an LCD panel on a digital connection) and power it
up again.  I did not notice anything of that sort when booting up
F10 kernels.

Quite likely rawhide already killed for me one monitor.  See
https://bugzilla.redhat.com/show_bug.cgi?id=478608
It was really an old one, so loses are rather minimal, and maybe
it just decided that enough is enough but coincidences, and the other
monitor behaviour, are a bit too much.

Am I the only one with such observations?

   Michal