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

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Date:	Mon, 11 Jan 2010 08:55:27 -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 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?

-- 
Jesse Barnes, Intel Open Source Technology Center


diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9187a17..0ab1bef 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3806,7 +3806,7 @@ static void intel_increase_pllclock(struct drm_crtc *crtc, bool schedule)
 	if (IS_IRONLAKE(dev))
 		return;
 
-	if (!dev_priv->lvds_downclock_avail)
+	if (!dev_priv->lvds_downclock_avail || 1)
 		return;
 
 	if (!HAS_PIPE_CXSR(dev) && (dpll & DISPLAY_RATE_SELECT_FPA1)) {
@@ -3845,7 +3845,7 @@ static void intel_decrease_pllclock(struct drm_crtc *crtc)
 	if (IS_IRONLAKE(dev))
 		return;
 
-	if (!dev_priv->lvds_downclock_avail)
+	if (!dev_priv->lvds_downclock_avail || 1)
 		return;
 
 	/*
--
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