[Bug 94806] New: Failed to prepare CRTC for page flipping, disabling TearFree

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94806

            Bug ID: 94806
           Summary: Failed to prepare CRTC for page flipping, disabling
                    TearFree
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: william at eshagh.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 122686
  --> https://bugs.freedesktop.org/attachment.cgi?id=122686&action=edit
xorg log

I can't enable tearfree on skylake.

-- system architecture: x86_64
-- kernel version: 4.5.0-040500-generic
-- Linux distribution: xubuntu 16.04
-- Machine or mother board model: Supermicro X11SSZ-F
-- Display connector: 3 displays: 1 DIV, 2 via displayport MST. One displayport
using active adapter to enable use of dual link DVI monitor. Issue occurs
without MST hub as well.

xorg conf:

Section "Extensions"
        Option "XVideo" "Disable"
EndSection

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option      "AccelMethod" "sna"
   Option      "TearFree" "true"
   Option      "DRI" "true"
#   Option      "DRI" "3"
   # VideoRam 461632   # sometimes (before i updated the bios, it were useful)
EndSection

xserver-xorg-video-intel                    2:2.99.917+git20160325-1ubuntu0.1

TearFree won't take, with xorg log reporting:

(EE) intel(0): Failed to prepare CRTC for page flipping, disabling TearFree

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