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<base href="https://bugs.freedesktop.org/" />
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<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>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>tommyhebb@gmail.com
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
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<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>
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