Bug 40031

Summary:	[Regression] testdisplay can't display correctly with 30 bpp
Product:	DRI	Reporter:	Yi Sun <yi.sun>
Component:	DRM/Intel	Assignee:	Jesse Barnes <jbarnes>
Status:	CLOSED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	ben, chris, jbarnes, maxime81
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Yi Sun 2011-08-12 00:55:47 UTC

System Environment:
-------------------
Platform: Ironlake (Lenovo T410)

Kernel: (drm-intel-fixes)d7d39e20cc5e44f915d6c5687f65839632c44381
Some additional commit info:
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Wed Aug 3 12:59:21 2011 -0700

    drm/i915: enable/disable spread spectrum as needed on mode set

Bug Description:
---------------------
While running the testdisplay with the parameater -d 30, the screen is mess. The monitor port is DP.

The good commit is :
Kernel: (drm-intel-fixes)4e6343898fe7eed6b3c0c3c809347bc88d5b4a1e
Some additional commit info:
Author: Keith Packard <keithp@keithp.com>
Date:   Sat Aug 6 10:39:45 2011 -0700

    drm/i915: Remove unused 'reg' argument to dp_pipe_enabled

Comment 1 Yi Sun 2011-08-12 00:57:00 UTC

The issue also can be reproduced on G45 platform.

Comment 2 Daniel Vetter 2012-02-14 11:42:29 UTC

Can you please recheck with latest -testing whether this is still an issue? The dp bw calculation fixes stand a good change to resolve this issue here.

Comment 3 Yi Sun 2012-02-14 22:58:48 UTC

Indeed, the issue is gone with the latest -testing branch.

Comment 4 Elizabeth 2017-10-06 14:52:07 UTC

Closing old verified.

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