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 1024x...@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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