ubuntu-x-swat team mailing list archive

[madbiologist <s.j.turner@xxxxxxxxx>]

You must be using userspace mode-setting (UMS), right?  The UMS mode-
setting code for Radeon HD5xxx series chips currently doesn't work well
for digital outputs.

Unfortunately kernel modesetting (KMS) for Radeon HD5xxx series chips
was only introduced upstream in kernel 2.6.34.

-- 
No HDMI output with RV870/HD5770
https://bugs.launchpad.net/bugs/580968
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which is subscribed to xserver-xorg-video-ati in ubuntu.