one of three monitors will not light up post-kms on radeon 5770
Submitted by Gabriel Somlo
Assigned to xf86-video-ati maintainers
Description
Created attachment 66584
dmesg output
I have the MacPro5,1 version of Radeon 5770 (see http://www.amazon.com/gp/product/B003Z6QH6M), and have three Dell U2412M monitors connected to it (two via miniDP-to-DP cables, the third one using the DVI cable included with the monitor).
X11 sees all three monitors (DisplayPort-0, DisplayPort-1, and DVI-0), but immediately after KMS during boot, DisplayPort-1 goes into powersave and cannot be "woken up". DisplayPort1 is the first screen that "lights up" when the machine is powered on. Once grub kicks in, both DisplayPort-0 and DisplayPort-1 are mirrored, with DVI-0 being off. After KMS, DVI-0 lights up, and DisplayPort-1 goes to sleep.
Tinkering with the Gnome display settings and/or xrandr will sometimes wake up DisplayPort-1, but always at the expense of turning off either DisplayPort-0 or DVI-0 instead. I could never get all three of them to light up under Linux.
I'm using up-to-date stock F16 (3.4.9-2.fc16.x86_64), but have also tried 3.6-rc4 with the same results.
I'm attaching my dmesg output and Xorg.0.log.
Attachment 66584, "dmesg output":
dmesg.out