[Bug 102251] New: i915, cannot set modeline (pipe state doesn't match)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=102251

            Bug ID: 102251
           Summary: i915, cannot set modeline (pipe state doesn't match)
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.2.0-0.rc3.git2.2.fc22.i686
          Hardware: i386
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dev at mgautier.fr
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 184211
  --> https://bugzilla.kernel.org/attachment.cgi?id=184211&action=edit
dmesg with drm.debug=0x1e

On a tablet WinBook TW700 (BayTrail), tablet screen stay black. Everything work
for the external plugged screen.

Kernel is this one :
http://copr.fedoraproject.org/coprs/hadess/32bit-boot/build/105288/

xrandr detect correctly the two screens (DSI1 and HDMI1)

>From trace, it seems that kernel cannot set modeline setting of the tablet
screen.

Attached trace is dmesg with kernel argument drm.debug=0x1e and the external
screen plugged. See timestamp 5.110791

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