linux-kernel - Re: xf86-video-armada via UDL [was: Re: UDL's fbdev doesn't work for user-space apps]

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Message-ID: <c6d06ae1-a30b-c358-6c12-317688d194a5@synopsys.com>
Date:   Mon, 4 Dec 2017 14:02:42 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "airlied@...il.com" <airlied@...il.com>,
        "airlied@...hat.com" <airlied@...hat.com>,
        "daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: xf86-video-armada via UDL [was: Re: UDL's fbdev doesn't work for
 user-space apps]

On 04-12-2017 13:16, Alexey Brodkin wrote:
>         Option          "kmsdev" "/dev/dri/card1"

Which drm driver uses /dev/dri/card0? I'm seing drmOpen code and
if you don't specify the busID it will fallback for the first
card that matches "armada-drm" or "imx-drm" or "udl".

> But if I swap "imx-drm" to "udl" I don't see anything on my screen
> (connected via UDL) even though Xserver seems to really start claiming the screen
> (so I see it becomes black, effectively overriding whatever was there before) and
> glmark benchmark prints results.
>
>

Xorg.log can help confirm if everything is ok.