[Bug 89155] Dual monitor setup does not initialize

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89155

            Bug ID: 89155
           Summary: Dual monitor setup does not initialize
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adam.reichold at t-online.de

Created attachment 113508
  --> https://bugs.freedesktop.org/attachment.cgi?id=113508&action=edit
journalctl -b | grep "\[drm"

I am running Arch Linux on an AMD A6-3500 with Radeon HD 6530D graphics on an
Gigabyte A55M-S2V mainboard. I just received updated X server to version 1.17.1
together with a rebuilt version 7.5.0 of the XFree86 ATI driver with the kernel
staying at 3.18.6.

I do have two Samsung monitors connected to the system, one via DVI and one via
VGA. This setup always initialized unreliably and I had to manually add modes
for the VGA-connected monitor using

xrandr --newmode "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059
1089 -hsync +vsync
xrandr --addmode VGA-0 "1680x1050_60.00"
xrandr --output VGA-0 --mode "1680x1050_60.00"

for it to work at all. But after the update described above, the two monitors
never initialize properly anymore. Before the update, I sometimes had to
power-cycle (meaning switch off power not just a reboot) but it did eventually
work after two or three tries.

The reason I am reporting this as a Radeon DRM issue instead of an X server
problem is that my system log contains errors from the DRM driver about
"channel eq" and "clock recovery". I attached those logs grepped for "[drm".

Thank for your help and please tell me if I can provide any further information
to help diagnose this.

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