linux-kernel - Re: Linux 2.6.33-rc4

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Message-ID: <20100114193118.GA1203@emergent.ellipticsemi.com>
Date:	Thu, 14 Jan 2010 14:31:18 -0500
From:	Nick Bowler <nbowler@...iptictech.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	airlied@...ux.ie
Subject: Re: Linux 2.6.33-rc4

On 21:15 Thu 14 Jan     , Pekka Enberg wrote:
> OK, I think I am seeing a different kind of flicker now. It doesn't 
> happen anywhere as often as before (which is probably why I missed it 
> last night). The flicker is more like a flash of some other window 
> whereas the flicker before used to "shake" the screen.
> 
> Does this ring a bell?

Your symptoms sound identical to mine on my ThinkPad T500 laptop, as
described in http://bugs.freedesktop.org/show_bug.cgi?id=25809.

This is the patch I am currently applying locally which solves all my
problems.

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index f4b4aa2..4fb5911 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -914,7 +914,7 @@ static void intel_find_lvds_downclock(struct drm_device *dev,
 	mutex_unlock(&dev->mode_config.mutex);
 	if (temp_downclock < panel_fixed_mode->clock) {
 		/* We found the downclock for LVDS. */
-		dev_priv->lvds_downclock_avail = 1;
+		dev_priv->lvds_downclock_avail = 0;
 		dev_priv->lvds_downclock = temp_downclock;
 		DRM_DEBUG_KMS("LVDS downclock is found in EDID. "
 				"Normal clock %dKhz, downclock %dKhz\n",

-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
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