Bug 28899

Summary:	[Arrandale] VGA video output wavy
Product:	DRI	Reporter:	jujubinche
Component:	DRM/Intel	Assignee:	Jesse Barnes <jbarnes>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	major
Priority:	medium
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description jujubinche 2010-07-03 15:38:33 UTC

VGA output is wavy on a dell vostro laptop (core i5 + intel hd graĥics).

I try all modelines i could, but the display is always more or less garbled with some sort of waves all over the screen. I have the same problem with another laptop and latest xf86-video-ati. 

Internel LVDS display work fine.

I can reproduce this strange behaviour on ubuntu 10.04, and on a gentoo with latest components (xorg 1.7.6, 1.8, xf86-video-intel 2.6.11, kernel 2.6.33 2.6.34 and 2.6.35-pre). Windows work fine on this hardware.

I find reports for a similar bug, but it affect ati hardware. It seems this commit fixed ati cards.
267364ac17f6474c69b03034340f769b22f46105
drm/radeon/kms: further spread spectrum fixes.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/539350
https://bugzilla.redhat.com/show_bug.cgi?id=571874

Comment 1 jujubinche 2010-07-03 15:46:56 UTC

The problem is also visible during boot process when kms is started, perhaps should i fill a kernel bug ? a drm bug ?

Comment 2 Gordon Jin 2010-07-04 18:37:36 UTC

(In reply to comment #1)
> The problem is also visible during boot process when kms is started, perhaps
> should i fill a kernel bug ? a drm bug ?

It's fine to stay under DRM component in this bugzilla.

Comment 3 jujubinche 2010-07-08 07:21:46 UTC


*** This bug has been marked as a duplicate of bug 28306 ***

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