he encontrado esto aunque es algo tedioso de hacer pero funciona:
Once you've rebooted into fullscreen mode open up the terminal and run the command below.
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fbset
This will display your current mode settings. Should look like this but your mode/geometry lines will vary.
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mode "1280x720-60"
# D: 74.178 MHz, H: 44.957 kHz, V: 59.942 Hz
geometry 1280 720 1280 720 32
timings 13481 260 110 39 26 80 5
bcast true
rgba 8/16,8/8,8/0,8/24
endmode
Take a look at the geometry line. Your going to be copying them to use for a startup script.
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geometry 1280 720 1280 720 32
The first line is your xres, in the example above the xres is 1280.
The second line is your yres, in the example above the yres is 720.
The third line is your -vxres, in the example above the -vxres is 1280.
The fourth line is your -vyres, in the example above the -vyres is 720.
xres and vxres = horizontal screen size
yres and vyres = vertical screen size
Copy these numbers your going to need them. Now you need to create a startup script. Open up the file browser and browse to (/etc/init.d) right click on an empty space and select create document empty file. Name it fbset and open it with the text editor. Now copy the command below into it but your going to use the geometry settings from your fbset test above.
Replace the -xres -vxres and -yres -vyres with your xres and yres numbers from the fbset test above.
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#!/bin/sh
/usr/sbin/fbset -a -xres 1280 -yres 720 -vxres 1280 -vyres 720
exit 0
Now once you've created the startup script in /etc/init.d open up the terminal and run the commands below.
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ln -s /etc/init.d/fbset /etc/rc5.d/S99fbset
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chmod 775 /etc/init.d/fbset
Now to fix your overscan issue open up the terminal and run the command below.
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gedit /etc/init.d/fbset
To get rid of the overscan just modify the -xres -yres -vxres -vyres lines by deducting 10 from each one and save the changes and reboot. It will take multiple reboots to get the correct settings but you will get it. Note your yres and vyres res will more then likely be correct long before the -xres -vxres. So once your yres and vyres are correct just stop reducing it and just recude the xres and vxres number save the changes and reboot you will evntually find the correct settings.
In the example above the correct settings ended up being.
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#!/bin/sh
/usr/sbin/fbset -a -xres 1200 -yres 680 -vxres 1200 -vyres 680
exit 0
So I ended up having to reduce the -xres -vxres by 80 and the -yres and -vyres by 40. To get the correct display settings. Once you've found the correct settings your all finished.