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

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Date:	Tue, 27 Oct 2009 14:26:09 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Riccardo Magliocchetti <riccardo.magliocchetti@...il.com>
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"

On Tue, 27 Oct 2009 22:21:39 +0100
Riccardo Magliocchetti <riccardo.magliocchetti@...il.com> wrote:

> 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

So just removing the above lines doesn't fix things, but reverting the
whole patch (c1c7af60892070e4b82ad63bbfb95ae745056de0) does?  If so the
only other thing I can think of is
2c907b72db4dd4e8af6dccb6e0ac122d78627b8d, which is in Linus's tree now,
but may not be in the drm-intel tree you're testing?

-- 
Jesse Barnes, Intel Open Source Technology Center
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