linux-kernel - Re: UDL's fbdev doesn't work for user-space apps

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Message-ID: <86238def-82be-2ad1-63d0-b9a8dbf83db6@synopsys.com>
Date:   Mon, 4 Dec 2017 11:50:40 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        "airlied@...il.com" <airlied@...il.com>
CC:     "tutankhamen@...omium.org" <tutankhamen@...omium.org>,
        "daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "airlied@...hat.com" <airlied@...hat.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "hshi@...omium.org" <hshi@...omium.org>
Subject: Re: UDL's fbdev doesn't work for user-space apps

Hi Alexey,

On 04-12-2017 11:32, Alexey Brodkin wrote:
> My first [probably incorrect] assumption is Xserver requires fbdev (/dev/fbX)
> and it cannot use DRI video card natively. Is that correct?
>
>

Xserver can use DRI directly, you need to enable modesetting
driver in Xorg config or use the designated driver for your card
(if there is any).

e.g.:

Section "Device"
        Identifier "Card0"
        Driver "modesetting"
        Option "kmsdev" "/dev/dri/card0"
        Option "SWcursor" "true"
        BusID "PCI:X:X:X"
EndSection

Best Regards,
Jose Miguel Abreu