linux-kernel - Re: i915: black screen after blank when LID is closed on Linux >= 3.1

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Message-ID: <20121122213522.GA12958@shrek.podlesie.net>
Date:	Thu, 22 Nov 2012 22:35:22 +0100
From:	Krzysztof Mazur <krzysiek@...lesie.net>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: i915: black screen after blank when LID is closed on Linux >= 3.1

On Thu, Nov 22, 2012 at 09:17:54PM +0100, Daniel Vetter wrote:
> Hi,
> 
> 
> Since a dpms ioctl call tends to follow a modeset, this likely only
> results in that dpms call enabling the hw again. Can you please add
> drm.debug=0xe to your kernel cmdline and boot into a 3.6 with this
> hack applied, reproduce the issue and the attach the complete dmesg?
> 
> The below WARNs from 3.7 support that, we've simply improved the
> code's ability to detect such problems. Can you please boot into a
> kernel with the latest drm-intel-next-queued branch merged in, but no
> other patches applied. Again please append drm.debug=0xe and then
> attach the complete dmesg after you've reproduced the issue.
> 
> Please also compile your kernels with CONFIG_PRINTK_TIME=y, the
> timestamps in dmesg help a lot in figuring things out.

In lastest drm-intel-next-queued (v3.7-rc4-323-g9352dce) I got
following compile error:

/home/krzysiek/src/linux-2.6/drivers/gpu/drm/i915/intel_lvds.c: In function 'intel_lvds_init':
/home/krzysiek/src/linux-2.6/drivers/gpu/drm/i915/intel_lvds.c:1098:34: error: 'mode' undeclared (first use in this function)
/home/krzysiek/src/linux-2.6/drivers/gpu/drm/i915/intel_lvds.c:1098:34: note: each undeclared identifier is reported only once for each function it appears in

Without thinking I fixed it by:

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index ced06f3..43f0874 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -1095,7 +1095,7 @@ bool intel_lvds_init(struct drm_device *dev)
 		fixed_mode = intel_crtc_mode_get(dev, crtc);
 		if (fixed_mode) {
 			DRM_DEBUG_KMS("using current (BIOS) mode: ");
-			drm_mode_debug_printmodeline(&mode);
+			drm_mode_debug_printmodeline(fixed_mode);
 			fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
 			goto out;
 		}

Thanks,

Krzysiek
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