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Date: Wed, 10 Nov 2010 19:47:09 -0600 From: Larry Finger <Larry.Finger@...inger.net> To: Chris Wilson <chris@...is-wilson.co.uk> CC: LKML <linux-kernel@...r.kernel.org> Subject: Regression in 2.6.37-rc1 for Intel 915 Graphics Adapter - bisected to commit e9e331a On my HP Mini 110 netbook with an Intel 945GME graphics adapter and kernel 2.6.37-rc1, screen blanking has a problem. On this machine, the screen is blanked in two stages. The first leaves the backlight on, the second turns the backlight off. The details of the graphics adapter are as follows: 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GME Express Integrated Graphics Controller [8086:27ae] (rev 03) Subsystem: Hewlett-Packard Company Device [103c:308f] Kernel driver in use: i915 00:02.1 Display controller [0380]: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller [8086:27a6] (rev 03) Subsystem: Hewlett-Packard Company Device [103c:308f] Beginning with commit e9e331a8abeece1565d383510ed985945132ffe3 as determined with bisection, the system no longer reawakens from the second stage with mouse movements or key presses. The only way to bring it back that I have found is to close the cover. After reopening the cover and entering the password to unlock the system, the screen is restored. The commit message is: Author: Chris Wilson <chris@...is-wilson.co.uk> Date: Mon Sep 13 01:16:10 2010 +0100 drm/i915/lvds: Ensure panel is unlocked for Ironlake or the panel fitter Commit 77d07fd9d73ef28689737c0952dbd5d6a5017743 introduced a regression where by not waiting for the panel to be turned off, left the panel and PLL registers locked across the modeset. Thus the panel remaining blank. As pointed out by Daniel Vetter, when testing LVDS it helps to open the laptop and look at the actual panel you are purporting to test. A second issue with the patch was that in order to modify the panel fitter before gen5, the pipe and the panel must have be completely powered down. So we wait. Larry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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