Created attachment 24820 [details] [review] xorg log after reboot. Last lines might be there because of switching to console (CTRL-ALT-F1) (xserver 7.4, radeon 6.12.2, kernel 2.6.29) After upgrading to xorg 1.6 (xserver 7.4) my dual head configuration stopped working. After reboot, only one of my two screens is working (not at default mode 1280x1024@85 but 1280x1024@60). The other one stays blank (powersave) xrandr tells me both screens were connected and set to 1280x1024. Manually trying "xrandr --output DVI-0 --left-of DVI-1" or vice versa switches screens, so the other one gets blanked. In KDE, running Display Settings, there are two screens shown, but pressing "identify screens" shows both, DVI-0 AND DVI-1 on the working screen. Also the image (in KDE Settings) only shows one screen with DVI-0 and DVI-1 written in it. After some time, when both screens go in powersave mode, waking them makes both work, but in clone mode.
Created attachment 24821 [details] xorg.conf for DUAL HEAD (worked with xorg 1.5)
Created attachment 24822 [details] xrandr output. contrary to this output, one screen is blanked (powersave mode)
Created attachment 24823 [details] KDE display settings, showing two screens in one. (look at the 1 and 0 in red circle)
Does reverting commit f8c7d6a6162196a743f6885ecaf63ba50de1722a help? If not any chance you could use git bisect to find the problematic commit?
Does: xset dpms force off followed by moving the mouse fix up dualhead?
yes, that fixed it.
reverting that commit indeed seems to fix the problem. eea9800890b56bac9c07b7bd9c9e33fae2938af3
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