Comment 51 for bug 144322

Just to note this is affecting my Radeon X550 after upgrading to Fedora 8
xorg-x11-drv-ati.x86_64-6.8.0-1.fc8
this has worked fine from fedora5 to fedora7

I'm using VGA->SCART to a PAL TV on the VGA port (port 0) nothing connected to DVI or STV ports (1 and 2)

What is actually being displayed is the odd scanrows from the top half of the screen double-scanned then a thick black + thin white vsync pulse in the centre of the screen followed by the even scanlines from the top half of the screen double-scanned.

The top half of the screen though shown twice, is not shrunken in height.

I confirmed the double-scanning by setting a special wallpaper which consists of (G)reen/(M)agenta/(B)lack pixels as follows

BBBBBBBBBBBBBBBBMMMMMMMMMMMMMMMMM
GGGGGGGGGGGGGGGGBBBBBBBBBBBBBBBBB
BBBBBBBBBBBBBBBBMMMMMMMMMMMMMMMMM
GGGGGGGGGGGGGGGGBBBBBBBBBBBBBBBBB

normally this gives a horrid interlaced flicker, but I used it previously to demonstrate that interlace is working properly.

With 6.8.0 the top half of the display shows as pure

BBBBBBBBBBBBBBBBBMMMMMMMMMMMMMMMM
BBBBBBBBBBBBBBBBBMMMMMMMMMMMMMMMM

and the bottom has as pure

GGGGGGGGGGGGGGGGGGBBBBBBBBBBBBBBB
GGGGGGGGGGGGGGGGGGBBBBBBBBBBBBBBB

I can't get any joy using the xrandr trick as suggested above