linux-kernel - Re: no video output after suspend after "drm/i915: force mode set at lid open time"

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Message-ID: <4AE76463.6010404@gmail.com>
Date:	Tue, 27 Oct 2009 22:21:39 +0100
From:	Riccardo Magliocchetti <riccardo.magliocchetti@...il.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	linux-kernel@...r.kernel.org, mjg@...hat.com, eric@...olt.net
Subject: Re: no video output after suspend after "drm/i915: force mode set
 at lid open time"

Jesse,

Jesse Barnes ha scritto:
> On Sun, 25 Oct 2009 21:57:32 +0100
> Riccardo Magliocchetti <riccardo.magliocchetti@...il.com> wrote:
> 
>> Hello,
>>
>> i lost video output, screen stays black, after suspend after commit 
>> c1c7af60892070e4b82ad63bbfb95ae745056de0 "drm/i915: force mode set at 
>> lid open time".
>>
>> I'm attaching my dmesg with 2.6.32-rc5 (actually
>> 964fe080d94db82a3268443e9b9ece4c60246414), my bisect log and my
>> config.
>>
>> git bisect response:
>>
>> c1c7af60892070e4b82ad63bbfb95ae745056de0 is the first bad commit
>> commit c1c7af60892070e4b82ad63bbfb95ae745056de0
>> Author: Jesse Barnes <jbarnes@...tuousgeek.org>
>> Date:   Thu Sep 10 15:28:03 2009 -0700
>>
>>      drm/i915: force mode set at lid open time
>>
[snip]
> 
> I wonder if this is the real problem...  This patch introduced an issue
> that was fixed by 06891e27a9b5dba5268bb80e41a283f51335afe7 that could
> cause a blank screen on lid open or resume, depending on how lid events
> were delivered.  Should be easy enough to test though, you can remove
> the whole
> 
> +       if (acpi_lid_open())
> +               drm_helper_resume_force_mode(dev);
> 
> block and see if that also helps (in the current tree there's a lock
> taken around the force_mode call, you'll need to remove those lines too
> for testing).

So i've tried separately both this and the patch with the fix for 
thinkpad (i have a samsung p460aa01 btw) with latest git and they have 
not fixed the issue.

+#if 0
  	if (acpi_lid_open() && !dev_priv->suspended) {
  		mutex_lock(&dev->mode_config.mutex);
  		drm_helper_resume_force_mode(dev);
  		mutex_unlock(&dev->mode_config.mutex);
  	}
+#endif

thanks,
riccardo

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