Problem with mode switching on ATI 7500

[Erez Hadad]

Hi all,

I have a laptop (Compaq Evo N1000v) with a graphics card of ATI Technologies
Inc Radeon Mobility M7 LW [Radeon Mobility 7500] with 32MB memory. I'm
running Fedora 8, and the auto-installed X driver is "radeon".

My problem is that whenever I switch from the default graphics mode (
1400x1050@60Hz) to any other mode, and specifically to text mode, the LCD
screen displays a white stain that expands and engulfs the entire screen,
making it completely white. However, when I switch back to graphics mode,
the display is resumed perfectly with the graphic desktop environment.

To make sure this is not a hardware problem, I ran X with the "vesa" driver,
and it worked smoothly for all mode switch operations, although this driver
yields (not surprisingly) lower performance in 3D, as I measured with the
glxgears app.

I attached the configuration and the log files of both vesa and radeon. One
thing I noted is that the radeon driver operates on all 3 outputs of the
card: the LVDS (which I believe is the LCD screen), the CRT (the external
VGA connector) and the TV (which is the external S-Video connector). I also
inserted "@@@@@" strings in the logs at the places where the mode-switch
took place. It seems that the "radeon" driver performs "RESTORE"
operations
on all the outputs when it comes back to graphics mode. However, when it
switches to text mode, it does not "RESTORE" the LVDS, just the TV and CRT
outputs (I think). Can this be somehow attributed to the fade-to-white
problem I mentioned above? Alternatively, can anyone suggest a way to make
the "radeon" driver work properly?

Note that the "vesa" driver does not log any meaningful operation on the
graphics card at all during mode switch - just switch the Synaptics touchpad
on and off.

I have also tried various combinations (from man-pages and web sites) of
both radeon-specific and generic options in the xorg.conf. None of these
combinations solved my problem.

Regards,
Erez Hadad