linux-kernel - Re: WARNING: CPU: 0 PID: 3634 at drivers/gpu/drm/drm_irq.c:1141 drm_wait_one

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Message-ID: <20150630201335.GA4496@dhcp22.suse.cz>
Date:	Tue, 30 Jun 2015 22:13:35 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: WARNING: CPU: 0 PID: 3634 at drivers/gpu/drm/drm_irq.c:1141
 drm_wait_one_vblank

On Tue 30-06-15 18:59:29, Daniel Vetter wrote:
[...]
> I looked at dmesg, nothing out of the ordinary there. Unfortunately also
> no hints why the pipe is somehow off when we think it's on. Can you please
> test the below patch and grab a new dmesg?

Attached.

> Also it might be time to start bisecting this if you can readily reproduce it.

Yes, I can reproduce it just by switching to the text console. Sometimes
it is the first attempt already but sometimes it takes several attempts.
I will try to go back to 4.0 and bisect it then.

> -Daniel
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index d0f3cbc87474..b8d9314ef459 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -12190,7 +12190,7 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
>  		 * flipping, so increasing its cost here shouldn't be a big
>  		 * deal).
>  		 */
> -		if (i915.fastboot && ret == 0)
> +		if (ret == 0)
>  			intel_modeset_check_state(set->crtc->dev);
>  	}
>  
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

-- 
Michal Hocko
SUSE Labs

Download attachment "dmesg.gz" of type "application/gzip" (25781 bytes)