[Bug 26616] New: [KMS] cannot find CRTC for LVDS; regression

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26616

           Summary: [KMS] cannot find CRTC for LVDS; regression
           Product: xorg
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: oldium.pro at seznam.cz
         QAContact: xorg-team at lists.x.org


Created an attachment (id=33367)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33367)
Output from `dmesg`

There is currently a regression in drm-radeon-testing branch of GIT kernel
source. The problem was originally fixed in bug #25150.

Symptoms:

LVDS shows only horizontal stripes during boot and changes color to white.
Monitor connected to DVI-0 runs well, X.org starts and runs on DVI-0 only.
Running

  xrandr --output LVDS --auto

shows "cannot find crtc for LVDS", but running 

  xrandr --output DVI-0 --off
  xrandr --output HDMI-0 --off
  xrandr --output LVDS --auto
  xrandr --output DVI-0 --auto

shows the screen correctly. I've bisected the drm-radeon-testing branch and the
first problematic commit is bcc1c2a1d22974215e39dc87ce746ba9a39223e5
"drm/radeon/kms: add initial Evergreen support (Radeon HD 5xxx)".

dmesg and Xorg.log attached.


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