linux-kernel - Re: How to use gma500 framebuffer driver?

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Date:	Sat, 12 Mar 2011 12:01:17 -0500
From:	Greg Brigley <gbrigley@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to use gma500 framebuffer driver?

Thanks guys.  I went to retrieve a dmesg dump for Alan, and thought I
should really do it without some other modules I had loaded, so the
output would be less cluttered.  When I did that, the framebuffer
worked!

I'll figure out which other module was causing the trouble and report back.

As for the mirrored display, is this something I might reasonably take
on myself, having no experience with  video drivers?  If so, pointers
for where to start looking would be great.

Greg



On Fri, Mar 11, 2011 at 2:34 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
>> 0e83f46d3869a5255a04b875bb885bd141a609ef, from Feb 26 - the last
>> commit on drivers/staging/gma500, and now I can build successfully,
>> but have not succeeded in producing video output.
>
> Currently it works on the Dell mini 10 and some other panels, but I know
> it's not yet working on quite a few other setups.
>
>> I guess I'll start by saying what I'm trying to do, to make sure I'm
>> not misguided in trying this in the first place.  I want to run Xfbdev
>> and drive both an LVDS and HDMI display at the same time (mirrored).
>> I don't need 2d or 3d acceleration.  I don't see an indication that
>> anyone else has tried mirrored displays with this driver, and I don't
>> mind being the first, but should it work in theory?  If it's not
>> supported, would it be difficult to add?
>
> It's on the todo list, as is non mirrored dual display.
>
>> So here are my questions for those who have used the staging driver:
>> * Should I be compiling it as a module, or as part of the kernel?
>
> Either - it's probably best tested as a module for the moment
>
>> * If I'm compiling it as a module, is there some sort of incantation
>> to make the framebuffer device show up when I insert the module?
>
> That would be the default behaviour providing it manages to set up the
> port. If it doesn't it will stay in text mode
>
>> Currently, when I insmod psb_gfx.ko, nothing appears in /proc/fb, or
>> in /dev.  I'm using udev.  If I do "mknod /dev/fb0 c 29 0", then both
>> fbset and Xfbdev give me "no such device" errors.
>
> What shows up in "dmesg" ?
>
> Alan
>
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