RPI, config.txt: overscan, not working

[Eric Gunther]

On Fri, 2014-12-26 at 10:44 +0100, Bernd Walter wrote:
> On Thu, Dec 25, 2014 at 03:39:53PM -0700, Ian Lepore wrote:
> > While searching for something else I just ran across this info:
> > 
> >         overscan_scale=1 caused the output of openFrameworks to respect
> >         the overscan_left, overscan_right, top and bottom settings with
> >         the use of an LCD display connected via composite.
> > 
> > So maybe just adding that to config.txt would make your overscan
> > settings work right.  I found that at:
> > 
> > http://elinux.org/RPiconfig
> 
> I have had a similar kind of problem long time ago.
> Story was a 1024x600 LC-display attached via converter to HDMI.
> Per default displayed 1024x768 with last 168 rows missing at bottom
> as HDMI specs only knows mode numbers with fixed resolutions.
> With LCD vendor supplied config.txt parameters I made it work under
> bootcode and Linux, but not under FreeBSD.
> I remember that Linux/bootcode behavour was very unexpected.
> I think it was something like this (don't remember exactly) in that top
> overscan removed one per pixel on top and bottom overscan removed 2 pixel
> on bottom, but also shifted the display up by one pixel.
> Under FreeBSD however the parameters behaved differently, so that the
> only option to remove bottom lines was to also remove top lines, which
> left 168 unused pixels on the top.
> IIRC I send a mail to this list about this problem.
> Never tested again since then.
> 

So far that seems to have worked very well.  No problems reading the
prompt, messages or boot.  I did notice though, and this may be obvious
to others, when you add overscan to one side the other side loses some.
Old TV with composite inputs.  Raspberry Pi Model B 512MB, FreeBSD:
FreeBSD-11.0-CURRENT-arm-armv6-RPI-B-20140903-r270990.img
available from, 
http://ftp.ksu.edu.tw/FTP/BSD/FreeBSD/snapshots/arm/armv6/ISO-IMAGES/11.0/
as well as others, I'm sure.

-e



> > On Mon, 2014-11-03 at 19:57 -0500, ito wrote:
> > > Hi,
> > > 
> > > 
> > > I Discovered that the framebuffer_width and framebuffer_height sizes
> > > seem to work but the overscan_left, overscan_right, etc. not as much.
> > > 
> > > I have settled on 
> > > 
> > > framebuffer_width=720
> > > framebuffer_height=400
> > > 
> > > referenced a well commented config.txt although solely added the two
> > > framebuffer entries to the existing config.txt because the overscan did
> > > not seem to work.
> > > 
> > > https://raw.githubusercontent.com/Evilpaul/RPi-config/master/config.txt
> > > 
> > > 
> > > Thanks for any advice,
> > > 
> > > ito
> > > 
> > > On Sun, 2014-11-02 at 03:46 -0500, ito wrote:
> > > > Is there anyone with an idea as to how I can stop the text from spilling
> > > > off the screen.
> > > > 
> > > > The display is in excess of 1/2 an inch all around.
> > > > 
> > > > Thanks,
> > > > 
> > > > ito
> > > > 
> > > > 
> > > > 
> > > > On Fri, 2014-10-31 at 13:00 -0400, ito wrote:
> > > > > Hello, 
> > > > > 
> > > > > I have a raspberry pi, 
> > > > > 
> > > > > 	Model B Revision 2.0 (512MB)
> > > > > which has the logo along with:
> > > > > 	Raspberry Pi 
> > > > > 	(c)2011.12 
> > > > > written on it.
> > > > > 
> > > > > I have obtained a image for freebsd to run from here:
> > > > > 
> > > > > ftp://ftp.freebsd.org/pub/FreeBSD/snapshots/arm/armv6/ISO-IMAGES/10.0/
> > > > > 
> > > > > 
> > > > > I uncompressed the image on a OpenSUSE system, and used,
> > > > > 
> > > > > sudo dd if=FreeBSD-10.0-RELEASE-arm-armv6-RPI-B-20140131-r260789.img
> > > > > of=/dev/sdd
> > > > > 
> > > > > to put the image on a micro SD... with that card and adapter I have
> > > > > successfully boot freebsd.
> > > > > 
> > > > > The problem I am facing now is that I am using the yellow SVGA (RCA type
> > > > > plug) cables to use an old Television as a monitor, with this setup I
> > > > > have an issue with the text running off of the screen.
> > > > > 
> > > > > I have tried the config.txt file with 
> > > > > overscan_disable=0 
> > > > > overscan_left=20
> > > > > overscan_right=20
> > > > > overscan_top=20
> > > > > overscan_bottom=20
> > > > > 
> > > > > 
> > > > > added to the existing config.txt
> > > > > 
> > > > > 
> > > > > 
> > > > > I have tried to load vesa:
> > > > > 
> > > > > kldload vesa
> > > > > 
> > > > > where I get a prompt that it does not exist.
> > > > > 
> > > > > I looked in the kernel directory (/boot/kernel/)  and there is no vesa,
> > > > > not sure what that means.
> > > > > 
> > > > > 
> > > > > I am assuming that there is something that is not happening with the
> > > > > config.txt.  I saw mention of using the files here to replace the files
> > > > > on the pi;
> > > > > 
> > > > > https://github.com/raspberrypi/firmware
> > > > > 
> > > > > 
> > > > > SO, essentially, how do I get the text to stop from spilling off of the
> > > > > screen (command prompt-no gui).
> > > > > 
> > > > > 
> > > > > Thank You,
> > > > > 
> > > > > ito
> > > > 
> > > 
> > > 
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> > 
> > 
> > 
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