[Bug 67906] New: [i915] Problem with pch dplls sharing. X fails to start with pipe_state doesn't match.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67906

          Priority: medium
            Bug ID: 67906
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [i915] Problem with pch dplls sharing. X fails to
                    start with pipe_state doesn't match.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: blami at blami.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 83842
  --> https://bugs.freedesktop.org/attachment.cgi?id=83842&action=edit
dmesg with drm.debug=0xe

Linux Kernel 3.11-rc4
Hardware: Lenovo Thinkpad X230 (Ivy Bridge) docked in MiniDock 3 with 2xDVI.

When both DVI displays are attached only one DVI display and LVDS are enabled
during boot (console). When trying to start X server it segfaults with (full
backtrace in attached dmesg):

srp 08 16:03:39 x230 kernel: WARNING: CPU: 0 PID: 2886 at
drivers/gpu/drm/i915/intel_display.c:8284 check_crtc_state+0x58f/0xa20()
srp 08 16:03:39 x230 kernel: pipe state doesn't match!

With only one DVI display attached everything works as expected.
Also on older stable kernels 3.9.x, 3.10.x everything works and all three
displays can be used as expected.

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