linux-kernel - Re: [Bug #14670] i915: playing video via XVideo extension makes the screen flicker

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Date:	Tue, 12 Jan 2010 09:57:02 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Thomas Meyer <thomas@...3r.de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Eric Anholt <eric@...olt.net>
Subject: Re: [Bug #14670] i915: playing video via XVideo extension makes the
 screen flicker

On Tue, 12 Jan 2010 18:43:09 +0100
Thomas Meyer <thomas@...3r.de> wrote:

> Am Montag, den 11.01.2010, 11:19 -0800 schrieb Jesse Barnes:
> > On Mon, 11 Jan 2010 20:03:57 +0100
> > Thomas Meyer <thomas@...3r.de> wrote:
> > 
> > > 
> > > 
> > > Am 11.01.2010 um 17:55 schrieb Jesse Barnes
> > > <jbarnes@...tuousgeek.org>:
> > > 
> > > > On Mon, 11 Jan 2010 17:53:04 +0100
> > > > Thomas Meyer <thomas@...3r.de> wrote:
> > > >
> > > >> Am Sonntag, den 10.01.2010, 23:56 +0100 schrieb Rafael J.
> > > >> Wysocki:
> > > >>> This message has been generated automatically as a part of a
> > > >>> report of regressions introduced between 2.6.31 and 2.6.32.
> > > >>>
> > > >>> The following bug entry is on the current list of known
> > > >>> regressions introduced between 2.6.31 and 2.6.32.  Please
> > > >>> verify if it still should be listed and let me know (either
> > > >>> way).
> > > >>>
> > > >>
> > > >> Yes, still should be listed.
> > > >>
> > > >> Problem still exists in 2.6.32.3 and 2.6.33-rc3-00097-g2c1f189,
> > > >> that contains
> > > >> this commit:
> > > >> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=cda9d05c499093c67b4a376a15009923acc2127a
> > > >>
> > > >> The above commit removes the render reclock support, that
> > > >> ought to fix a common kind of problem encountered on i915
> > > >> hardware, but not on my machine.
> > > >>
> > > >> Still need to boot with "nomodeset" to have a workable system.
> > > >
> > > > Does this patch prevent the flicker?
> > > 
> > > By the way: how often and in what interval is the function   
> > > intel_lvds_detect called?
> > > 
> > > How long will/can the function acpi_lid_open take to complete?
> > > Maybe some acpi interpretation takes really long? Is this
> > > possible?
> > > 
> > > Would this explain the flickering?
> > 
> > It should only be called when a client requests the connection
> > status (e.g. xrandr or the GNOME display applet).
> 
> how to check how often this function is called and it's duration? is
> the function tracer capable of this?

Yeah, the function tracer should be able to do it (though I don't know
how to use it offhand, maybe through the perf tool?).  Or you could
just add some DRM_ERROR lines. :)

> > The LVDS state will also be checked at ACPI LID event time, maybe
> > your platforms is getting spurious LID events?
> 
> maybe! where can I check this? acpid log file?

Yeah or using acpi_listen I think.

-- 
Jesse Barnes, Intel Open Source Technology Center
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