<html>
    <head>
      <base href="https://bugs.freedesktop.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [IVB] Banding after EFI boot"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=65593">65593</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[IVB] Banding after EFI boot
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>tommyhebb@gmail.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=80593" name="attach_80593" title="Photo of banding effect">attachment 80593</a> <a href="attachment.cgi?id=80593&action=edit" title="Photo of banding effect">[details]</a></span>
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.</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are the QA Contact for the bug.</li>
          <li>You are the assignee for the bug.</li>
      </ul>
    </body>
</html>