Created attachment 66584 [details] 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.
Created attachment 66585 [details] xorg log
Please try the latest 3.6.0 kernels or my 3.6 fixes tree: http://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-fixes-3.6 There are a number of modesetting fixes that may help.
You might also try this patch: http://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-3.7-wip&id=c1857e07e8abac2c19fda9b1da96ac461ec55827
(In reply to comment #3) > You might also try this patch: > http://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-3.7-wip&id=c1857e07e8abac2c19fda9b1da96ac461ec55827 This (on top of 3.6-rc4, which already contains everything you point to in comment #2, and which I had already tried before opening this) fixes the problem and lights up all three of my monitors --Thanks !
A patch referencing this bug report has been merged in Linux v3.7-rc1: commit f3dd8508d459a2d0d0bc426144b92f1696d4fe86 Author: Alex Deucher <alexander.deucher@amd.com> Date: Fri Aug 31 11:56:50 2012 -0400 drm/radeon: rework pll selection (v4)
A patch referencing this bug report has been merged in Linux v3.6-rc6: commit 985f61f7ee647ad570c05eab0b74915da2ac8e19 Author: Alex Deucher <alexander.deucher@amd.com> Date: Fri Aug 31 11:56:50 2012 -0400 drm/radeon: rework pll selection (v3)
A patch referencing a commit referencing this bug report has been merged in Linux v3.6-rc7: commit 2f1f4d9b60396d2df4cff829bd5376ffc8ed9a2c Author: Alex Deucher <alexander.deucher@amd.com> Date: Mon Sep 17 17:26:24 2012 -0400 Revert "drm/radeon: rework pll selection (v3)"
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