Turning KMS on didn't work for me either - I also got mangled fonts plus other corruptions. I attach the output of dmesg, there are some error messages like...
[15318.655652] i2c-adapter i2c-1: unable to read EDID block.
[15318.655657] radeon 0000:01:00.0: LVDS-1: no EDID data
I wonder if we should open another bug, maybe at bugs.freedesktop.org, to see which ATI chips are affected...
Turning KMS on didn't work for me either - I also got mangled fonts plus other corruptions. I attach the output of dmesg, there are some error messages like...
[15318.655652] i2c-adapter i2c-1: unable to read EDID block.
[15318.655657] radeon 0000:01:00.0: LVDS-1: no EDID data
I wonder if we should open another bug, maybe at bugs.freedeskto p.org, to see which ATI chips are affected...
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon RV250 [Mobility FireGL 9000] [1002:4c66] (rev 01)