Comment 77 for bug 118745

(In reply to comment #9)
> Alex, I am not sure if I can agree with last comment: on Ubuntu Gutsy, which is
> running xserver 1.3, panel size (and consequently DPI) is properly detected
> with ATI driver 1:6.6.193-1ubuntu1, but it does not get detected with ati
> driver with xrandr (this was regression identified with my early testing of
> xrandr branch and is still there in 1:6.7.192-1ubuntu2).
> Since it looks like driver is reporting proper size in log file, but later does
> not use it properly, is it possible that this get somehow mangled in the driver
> before passing further?
>

The old driver implemented it's own dualhead system (mergedfb) right in the driver. The old driver DID mess with the dpi because it handled the randr type functionality itself. With randr all of that moved to the server. The server should be doing the right thing. If it's broken for radeon, it's also broken for intel or mga or whatever other randr driver you are using. The drivers shouldn't be duplicating dpi fixups.