Bug 25584 - [G35 XV] Display flickers when skipping ahead in MythTV
Summary: [G35 XV] Display flickers when skipping ahead in MythTV
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: 7.4 (2008.09)
Hardware: x86 (IA32) Linux (All)
: medium normal
Assignee: Carl Worth
QA Contact: Xorg Project Team
Keywords: NEEDINFO
Depends on:
Reported: 2009-12-11 05:52 UTC by Michael Wright
Modified: 2010-07-15 04:05 UTC (History)
1 user (show)

See Also:
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).


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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