Xfbdev fails with "no screens found"

[Dushara Jayasinghe]

  Hi Thanks for the reply.

Somehow I stuffed up the post with all the relevant info. I've pasted it 
here again:

----------------------------------- >8  
----------------------------------------
DISPLAY wasn't the issue. To cut a long story short... I needed to 
update some stuff on buildroot.

However, it's still not working properly. I had to add the attached 
patch to get it to work with the frame buffer device I'm using. Xfbdev 
runs fine now but when I execute xlogo, nothing is displayed on the 
screen. The part of the screen gets 'cleared' so I know that it writes 
/something/ to /dev/fb0.

The output of fbset -i:

# fbset -i

mode "240x128-158"
# D: 5.000 MHz, H: 20.325 kHz, V: 157.560 Hz
geometry 240 128 240 128 1
timings 200000 3 1 0 0 2 1
rgba 0/0,0/0,0/0,0/0
endmode

Frame buffer device information:
Name : DISP0 BG
Address : 0x906b8000
Size : 4096
Type : PACKED PIXELS
Visual : MONO01
XPanStep : 1
YPanStep : 1
YWrapStep : 0
LineLength : 32
Accelerator : No
#

----------------------------------- >8  
----------------------------------------

I'm using Xfbdev because, this is for an embedded product and I want to 
keep things as small as possible.

The framebuffer driver I'm using is for a monochrome LCD panel running 
on an iMX.25 based system (I tweaked the driver supplied by Freescale to 
suite our needs.

Thanks.
Dushara

P.S. What is preferred on this ML top/bottom posts?

On 14/04/2011 12:03 PM, zt.tmzt at gmail.com wrote:
>
>
> Hi.
> Could you explain in more detail what you are trying to do, include 
> the output of fbset on your hardware and what framebuffer driver you 
> are using?
>
> Xfbdev is not a nested server, don't see how setting DISPLAY would help.
>
> If you can, please strace Xfbdev and include that as well. I assume an 
> IOCTL is failing though I don't see any detailed logs. Xfbdev is based 
> on the kdrive X server, it doesn't have the same configuration or 
> logging as Xorg servers do. Why do you need to use Xfbdev, does Xorg 
> (fbdev driver) not work?
>
> Thanks,
> Timothy Meade
> tmzt on #xorg and #xorg-users
>
> On Apr 13, 2011 7:50 PM, "Dushara Jayasinghe" 
> <dushara.jayasinghe at hydrix.com <mailto:dushara.jayasinghe at hydrix.com>> 
> wrote:
> >
> > Sorry reposting this coz I stuffed up the subject...
> >
> > On 13/04/2011 4:34 PM, Dushara Jayasinghe wrote:
> >>
> >>  On 12/04/2011 11:06 AM, xorg-devel-request at lists.x.org 
> <mailto:xorg-devel-request at lists.x.org> wrote:
> >>>
> >>> Date: Mon, 11 Apr 2011 21:55:27 +0200
> >>> From: Abdoulaye Walsimou GAYE<awg at embtoolkit.org 
> <mailto:awg at embtoolkit.org>>
> >>> Subject: Re: Xfbdev fails with "no screens found"
> >>> To: xorg-devel at lists.x.org <mailto:xorg-devel at lists.x.org>
> >>> Message-ID:<4DA35CAF.1090708 at embtoolkit.org 
> <mailto:4DA35CAF.1090708 at embtoolkit.org>>
> >>> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> >>>
> >>> On 04/11/2011 10:01 AM, Dushara Jayasinghe wrote:
> >>>>
> >>>> Hi all,
> >>>>
> >>>> I'm trying to use Xfbdev on an embedded linux device with a 
> monochrom LCD display. However, the command returns the following error:
> >>>>
> >>>> Fatal server error:
> >>>> no screens found
> >>>>
> >>>> Using xserver_xorg-server-1.7.5
> >>>> with kdrive/fbdev
> >>>
> >>> Hello,
> >>> does the following command line, before starting Xfbdev, fixes the 
> issue:
> >>> export DISPLAY=:0
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> xorg-devel at lists.x.org <mailto:xorg-devel at lists.x.org>: X.Org 
> development
> >>> Archives: http://lists.x.org/archives/xorg-devel
> >>> Info: http://lists.x.org/mailman/listinfo/xorg-devel
> >
> >
> > --
> > Dushara Jayasinghe | Senior Software Engineer
> > dushara.jayasinghe at hydrix.com <mailto:dushara.jayasinghe at hydrix.com> 
> | +61 3 8573 5221
> > Hydrix: Our Expertise – Your Competitive Advantage
> > www.hydrix.com <http://www.hydrix.com> | fax +61 3 9572 2686 | phone 
> +61 3 8573 5299
> >
> > _______________________________________________
> > xorg-devel at lists.x.org <mailto:xorg-devel at lists.x.org>: X.Org 
> development
> > Archives: http://lists.x.org/archives/xorg-devel
> > Info: http://lists.x.org/mailman/listinfo/xorg-devel
>

-- 
Dushara Jayasinghe | Senior Software Engineer
dushara.jayasinghe at hydrix.com | +61 3 8573 5221
Hydrix: /Our Expertise – Your Competitive Advantage/
www.hydrix.com | fax +61 3 9572 2686 | phone +61 3 8573 5299
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