In this kernel the 3rd display only comes on for a few partial frames every 20 to 40 seconds. Three displays attached to motherboard. Under kernel 3.11.10, Radeon driver operates correctly. Using: ASRock FM2A85X-ITX MB AMD A10-6800k (Not overclocked) 8 GB DDR3 VGA montitor - Dell flat screen - 19" HDMI0 montitor - (via DVI connector) - Acer 23" flat. HDMI1 montitor - (via HDMI connector) - Acer 22" flat VGA is 1 - on an the left. HDMI1 is 2 - in the center. HDMI0 is 3 - on the right.
Can you bisect?
Please attach your xorg log and dmesg output as well.
I'm not sure what you mean.
Created attachment 118061 [details] dmesg
Created attachment 118071 [details] Xorg.log
Created attachment 118081 [details] System messages
Fedora released 3.13.3 (kernel.x86_64 0:3.13.3-201.fc20) and this is still happening; though, it doesn't happen with 3.12.10 (kernel-3.12.10-300.fc20.x86_64).
Can you use git to bisect what commit caused the regression? Google for git bisect howto.
(In reply to Alex Deucher from comment #8) > Can you use git to bisect what commit caused the regression? Google for git > bisect howto. 3.12.5 Found a workaround: Allow nromal boot to graphical environment with all monitors powered on. After GUI login is displayed and DVI connected monitor is blank do <ctrl><alt>F2 to switch to text console. Wait until all working displayas are stable then power off and power on non-fucntional display via its power button. Wait until all displays are stable then return to GUI.