[Bug 107650] New: Invalid three-monitor setup configured for LVDS/DP/HDMI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107650

            Bug ID: 107650
           Summary: Invalid three-monitor setup configured for
                    LVDS/DP/HDMI
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: Simon.Richter at hogyros.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 141223
  --> https://bugs.freedesktop.org/attachment.cgi?id=141223&action=edit
X log, three-monitor setup, DP port in HDMI mode (works)

When two external monitors supporting the same timings are connected, the
driver attempts to reuse a CRTC, however this fails if one is connected via DP
and the other via HDMI or DVI, as the DP link requires a different PLL setup.

xrandr handles this restriction, reporting an error from the CRTC setup (the
virtual CRTC 2 just reports failure), but on startup, this check is not
performed properly, and the X server starts up with two usable displays and one
confused monitor that will neither go to powersave nor show a picture.

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