[Bug 93393] New: Regression for Skylake modesetting in kernel 4.4 with 2 Displays of different resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93393

            Bug ID: 93393
           Summary: Regression for Skylake modesetting in kernel 4.4 with
                    2 Displays of different resolution
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: kai at stella.at
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 120534
  --> https://bugs.freedesktop.org/attachment.cgi?id=120534&action=edit
Kernel Log of failed kms on one display (drm.debug=0x0e)

i am testing kernel 4.4 RC cause of the problems in Bug 89055.  while it looked
very good yesterday today on freshly turning on the computer i noticed a big
regression.
I have 2 displays with different resolution one Full HD display connected via
HDMI, and one 1680x1050 which is connected via DVI. 
And with kernel 4.4 on a freshly tuned on system the 1680x1050 Display turns
off itself with an out of range error. i tried it a few times, and it was
completely reproducable as long as the system was freshly turned on, when i
boot once with kernel 4.3 and then reboot with 4.4 then everyting works.

on the last bug someone told me to enable drm.debug=0x0e so i attach a log with
that option turned on, hope it helps.

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