[Bug 65593] New: [IVB] Banding after EFI boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65593

          Priority: medium
            Bug ID: 65593
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB] Banding after EFI boot
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: tommyhebb at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 80593
  --> https://bugs.freedesktop.org/attachment.cgi?id=80593&action=edit
Photo of banding effect

Bug description:
After a cold boot of my MacBook Pro 9,2 using EFI (the problem does not appear
using BIOS emulation), there is a disjoint (band) between lighter and darker
colors (see attached photo). The problem disappears after suspending and
resuming the system.

System environment:
-- chipset: Intel(R) Ivybridge Mobile (GT2)
-- system architecture: 64-bit
-- xf86-video-intel: 2.21.9
-- xserver: 1.14.1
-- mesa: 9.1.3
-- libdrm: 2.4.45
-- kernel: 3.9.5
-- Linux distribution: Arch Linux (with [testing])
-- Machine or mobo model: MacBookPro9,2
-- Display connector: FPD-Link (Internal display)

Reproducing steps:
-- Boot Linux on a MacBook Pro 9,2 using any UEFI bootloader.
-- Display a gradient on the screen using any method.

Additional info:
When the issue is present, gamma adjustments I make using xgamma only apply to
the darker colors. At a gamma of 1.1, the band disappears (photo is of gamma
1.0). After a suspend and resume, gamma adjustments apply to the entire screen.

The issue appears both inside and outside of X.

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