From: "Michel Dänzer" <michel@daenzer.net>
To: Boszormenyi Zoltan <zboszor@pr.hu>
Cc: DRI devel <dri-devel@lists.freedesktop.org>
Subject: Re: Black screen with KABINI with kernel 4.5 with or without DAL
Date: Tue, 5 Apr 2016 15:27:25 +0900 [thread overview]
Message-ID: <57035ACD.3080103@daenzer.net> (raw)
In-Reply-To: <570339FE.7010606@pr.hu>
On 05.04.2016 13:07, Boszormenyi Zoltan wrote:
> 2016-04-05 05:40 keltezéssel, Michel Dänzer írta:
>> On 05.04.2016 00:25, Boszormenyi Zoltan wrote:
>>>
>>> The application is Chromium in kiosk mode. The problem is that
>>> sometimes the screen stays black after KMS kicks in.
>> So the problem occurs even without X? Does it affect HDMI or
>> DisplayPort, or both?
>
> It occurs on both but not without X. Ctrl-Alt-F2 gives me the
> console login prompt. My phrasing was not what I wanted to write
> and didn't finish the sentence really. X is started very early during
> boot so I can see the console message only momentarily while
> the screen is still in 80x25 VGA text mode. Restarting Xorg via
> systemctl makes it working most of the time.
>
> Apparently, it's not Radeon specific. We were also able to reproduce
> it on an Intel machine, too, with internal LVDS and external VGA outputs.
I suspect it's a client side problem then. Comparing the good and bad
dmesg output shows that Xorg is busily updating the screen in the good
case (visible as radeon_crtc_page_flip gets called by TearFree) but not
so in the bad case. Since the default Xorg startup behaviour is a black
screen, it sounds like simply no client connects to Xorg / draws
anything to the screen in the bad case. Maybe there's a race which can
result in the client(s) starting up before Xorg, failing to establish
the display connection, or something like that.
> Is Xorg 1.16.4 still a supported version with new kernels?
There's no direct version inter-dependency between Xorg and the kernel.
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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next prev parent reply other threads:[~2016-04-05 6:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-04 15:25 Black screen with KABINI with kernel 4.5 with or without DAL Boszormenyi Zoltan
2016-04-05 3:40 ` Michel Dänzer
2016-04-05 4:07 ` Boszormenyi Zoltan
2016-04-05 6:27 ` Michel Dänzer [this message]
2016-04-06 8:52 ` Boszormenyi Zoltan
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