DisplayPort output broken

[Andreas Demmer]

Hi,

I have a notebook with switchable graphics (discrete ATI Mobility Radeon HD 
5650 and integrated Intel Arrandale). The DisplayPort only works with the 
discrete adapter but this limitation also exists in Windows, so I guess the 
DisplayPort is hard-wired to the discrete card.

If I use the radeon driver, it detects whenever I plug something into the 
DisplayPort. E.g. I have a DisplayPort-to-VGA adapter (for projectors) and 
test it with my LCD monitor that luckily has a VGA input, too. xrandr detects 
the connection and suggests the correct resolution and frequency (1680x1050 
@60Hz). But the image is totally distorted. It looks like a old tube monitor 
that runs a too high frequency.

I switched back to 1024x768 at 60Hz but the problem persists. The same settings 
work fine with Windows, so I suspect this issue to be caused by the radeon 
driver.

Is there any way to see what's going wrong and maybe fix this?

Greets,
Andreas

-- 
http://www.andreas-demmer.de
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