Bug 25584

Summary:	[G35 XV] Display flickers when skipping ahead in MythTV
Product:	xorg	Reporter:	Michael Wright <bodyjarrocks>
Component:	Driver/intel	Assignee:	Carl Worth <cworth>
Status:	RESOLVED INVALID	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium	CC:	bodyjarrocks
Version:	7.4 (2008.09)	Keywords:	NEEDINFO
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Michael Wright 2009-12-11 05:52:50 UTC

Bug description:
I have an really annoying flickering problem.  In MythTV, pressing skip ahead causes my screen to flicker for about 5-7 seconds after which time it settles back to a solid image.  This happens about 40% of the time I press skip ahead.  I have taken a video at 60fps of the problem with my Canon IXUS 50:

http://members.iinet.net.au/~mikewright/TopGear_Flicker.avi    (about 13Mb)

I don't think this is an XV-only issue, since killing MythTV during the flicker reveals the whole X desktop flickering then settling soon after.

I am running:
- Ubuntu Jaunty
- MythTV 0.21-fixes using XV overlay.
- 1280x720@50Hz
- I'm using Yadif de-interlacer.

System environment:
-- chipset: G35
-- system architecture: 32-bit
-- xf86-video-intel: 2.6.3
-- xserver: 1.6.0
-- mesa: standard
-- libdrm: 2.4.0
-- kernel: 2.6.28-15-generic
-- Linux distribution: Ubuntu Jaunty
-- Machine or mobo model: Asus P5E-VM
-- Display connector: HDMI

Reproducing steps:
Skip head by 30 seconds using remote or keyboard in MythTV.

Comment 1 Carl Worth 2010-02-17 09:30:35 UTC

We had bugs in the kernel-driver component that led to FIFO underruns,
(which manifested as annoying full-screen flickering).

I recommend you upgrade to a more recent kernel (such as 2.6.32) and please
let us know if the problem persists, (and please clear the NEEDINFO keyword
when you reply).

Thanks,

-Carl

Comment 2 Chris Wilson 2010-07-15 04:05:41 UTC

Timeout. Could be a fifo underrun, but unless it can be reproduced on the current KMS + kernel overlay stack (where there has been a number of underrun bugs fixed, introduced, and fixed again), there is no point investigating. However, as I am looking at kernel overlay bugs atm I will keep an eye out for this issue.

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