[Bug 106804] New: i195: modesetting stops working on kernel 4.17, works fine on 4.16

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106804

            Bug ID: 106804
           Summary: i195: modesetting stops working on kernel 4.17, works
                    fine on 4.16
           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: arekm at maven.pl
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 140000
  --> https://bugs.freedesktop.org/attachment.cgi?id=140000&action=edit
xorg log

xserver 1.20, kernel 4.17 and modesetting fails:

[   126.170] (EE) modeset(0): failed to set mode: Invalid argument

while it works fine on 4.16 kernel.

Bisected to commit below and indeed, reverting it on current
kernel git makes the problem go away.



commit e995ca0b8139c5f6807095464e969931b443f55a
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Tue Nov 14 20:32:58 2017 +0200

    drm/i915: Provide a device level .mode_valid() hook

    We never support certain mode flags etc. Reject those early on in the
    mode_config.mode_valid() hook. That allows us to remove some duplicated
    checks from the connector .mode_valid() hooks, and it guarantees that
    we never see those flags even from user mode as the
    mode_config.mode_valid() hooks gets executed for those as well.

    Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20171114183258.16976-11-ville.syrjala@linux.intel.com
    Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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