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

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Date:   Tue, 12 Dec 2017 19:48:05 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     "pavel@....cz" <pavel@....cz>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>,
        "hshi@...omium.org" <hshi@...omium.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "tutankhamen@...omium.org" <tutankhamen@...omium.org>,
        "Jose.Abreu@...opsys.com" <Jose.Abreu@...opsys.com>,
        "airlied@...hat.com" <airlied@...hat.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "airlied@...il.com" <airlied@...il.com>
Subject: Re: UDL's fbdev doesn't work for user-space apps

Hi Pavel,

On Sat, 2017-12-09 at 18:20 +0100, Pavel Machek wrote:
> On Mon 2017-12-04 11:50:40, Jose Abreu wrote:
> > 
> > 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).
> 
> Still, dev/fb1 should work.

Agree, but it doesn't :)
Even on completely different architectures (ARC and ARM).

> Can be tested using dd, even :-)

Most probably so but not in case of UDL as of today :(
I mean as long as it does't work dd etc make no sense.

-Alexey