[Bug 97992] New: [PATCH] Lenovo L440 backlight better with OpRegion panel type

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97992

            Bug ID: 97992
           Summary: [PATCH] Lenovo L440 backlight better with OpRegion
                    panel type
           Product: DRI
           Version: unspecified
          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: risto.toijala at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126908
  --> https://bugs.freedesktop.org/attachment.cgi?id=126908&action=edit
Patch to add the Lenovo L440 to the OpRegion whitelist

Linux 4.7.4 included commit a05628195a0d ("drm/i915: Get panel_type from
OpRegion panel details"), which improved backlight handling on the Lenovo
ThinkPad L440 laptop: it allowed a greater range of brightnesses near zero.

Linux 4.7.5 reverted back to not using the OpRegion panel type, which means
that the improvement regressed.

The OpRegion panel type did not cause any problems, and worked better than the
other implementation.

The attached patch adds the Lenovo L440 to the OpRegion panel type whitelist.

Is this the correct way to add the laptop? Could it be upstreamed?

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