linux-kernel - Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with radeon

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Date:	Mon, 18 Jan 2016 11:49:59 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Mario Kleiner <mario.kleiner.de@...il.com>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	Daniel Vetter <daniel.vetter@...ll.ch>, mgraesslin@....org,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org,
	LKML <linux-kernel@...r.kernel.org>, kwin@....org
Subject: Re: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with
 radeon

On 01/16/2016 05:24 AM, Mario Kleiner wrote:
>
>
> On 01/15/2016 01:26 PM, Ville Syrjälä wrote:
>> On Fri, Jan 15, 2016 at 11:34:08AM +0100, Vlastimil Babka wrote:
>
> I'm currently running...
>
> while xinit /usr/bin/ksplashqml --test -- :1 ; do echo yay; done
>
> ... in an endless loop on Linux 4.4 SMP PREEMPT on HD-5770  and so far i
> can't trigger a hang after hundreds of runs.
>
> Does this also hang for you?

No, test mode seems to be fine.

> I think a drm.debug=0x21 setting and grep'ping the syslog for "vblank"
> should probably give useful info around the time of the hang.

Attached. Captured by having kdm running, switching to console, running 
"dmesg -C ; dmesg -w > /tmp/dmesg", switch to kdm, enter password, see 
frozen splashscreen, switch back, terminate dmesg. So somewhere around 
the middle there should be where ksplashscreen starts...

> Maybe also check XOrg.0.log for (WW) warnings related to flip.

No such warnings there.

> thanks,
> -mario
>
>
>>> Thanks,
>>> Vlastimil
>>


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