Hi,

Following our recent discussion about my DRM/i830 problems
with XFree on my Dell Optiplex GX260 (see
http://marc.theaimsgroup.com/?l=linux-kernel&m=111020328808689&w=2), 
here comes the intelfb part of my bug report.

Booting with intelfb works great: As long as I don't start the
X server, I can work and switch between the framebuffer text consoles.

If I start the X server (XFree 4.3.0 from Debian testing before,
Xorg 6.8.2 now), I can't switch back to fb text consoles:
First time I chvt [123456], it switches to a **non-FB** text console
for about 1 second, and then to a black screen (sometimes, a colored
column appear when I try to type something on my keyboard).

During this 1 second, there are some messages written wherever in
the text console. They look like the begining of dmesg.
They are mis-aligned, probably because the resolution of the text
console is different from the FB text console.

Switching back to the X server works.
Switching back to a FB text console leads to a dirty screen
with white and black columns on the left, and everything black
on the right.

dmesg show this when switching from X to a FB text console
for the first time:
intelfb: ring buffer : space: 8488 wanted 65472
intelfb: lockup - turning off hardware acceleration

Note that disabling DRI in Xorg doesn't change anything.

dmesg, lspci et config are attached.

This is with 2.6.11. But I don't remember having seen intelfb
works since it was introduced in vanilla.
2.6.12-rc1 and 2.6.12-rc1-mm1 don't change anything, except
maybe the dirtiness of the FB screen.

Regards
Brice Goglin