Overscan problem: Screen is larger than monitor

[Adam]

Hi!

I using a A20-OlinuXino-Lime with debian with a LCD TV throught HDMI.
On any resolution, the Desktop/Screen is larger than my Monitor Display.

I readed many times, the problem is on TV side, but I have no any option for picture/scale settings on my TV. LCD TV is very old (Mirai 32"). On newer TV (LG LM670s) screen works fine. But I dont want to buy a new TV due to OlimexBoard. I need to fix this by software.

Can anyone help me to correct this on Debian A20?

Thanks for your help

[Insomniac10102]

You should be able to use xrandr to offset it using underscan. Something like:

xrandr --output <output> --set underscan on --set "underscan hborder" <horizontal border> --set "underscan vborder" <vertical border>

[Adam]

Hi, thank you for your reply. I already tried play with xrandr, but with no success.

Here is list of screens:

Code Select Expand

root@a20-OLinuXino:/home/olimex# xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1280 x 720, current 1280 x 720, maximum 1280 x 720
default connected 1280x720+0+0 0mm x 0mm
   1280x720       50.0*


And here is output after command set underscan

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root@a20-OLinuXino:/home/olimex# xrandr --output default --set underscan on
xrandr: Failed to get size of gamma for output default
X Error of failed request:  BadName (named color or font does not exist)
  Major opcode of failed request:  149 (RANDR)
  Minor opcode of failed request:  11 (RRQueryOutputProperty)
  Serial number of failed request:  21
  Current serial number in output stream:  21


Dont really know, what to do... Please help.

Adam

[Insomniac10102]

Try replacing --output default to --output Screen\ 0 or --output 'Screen 0'. Hopefully one of those works.

[Adam]

Hi insomniac... I tried your tip, but still not working. Here is output:

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root@a20-OLinuXino:/home/olimex# xrandr --output 'Screen 0' --set underscan on
xrandr: Failed to get size of gamma for output default
warning: output Screen 0 not found; ignoring
X Error of failed request:  BadRROutput (invalid Output parameter)
  Major opcode of failed request:  149 (RANDR)
  Minor opcode of failed request:  15 (RRGetOutputProperty)
  Serial number of failed request:  20
  Current serial number in output stream:  20

root@a20-OLinuXino:/home/olimex# xrandr --output Screen\ 0 --set underscan on
xrandr: Failed to get size of gamma for output default
warning: output Screen 0 not found; ignoring
X Error of failed request:  BadRROutput (invalid Output parameter)
  Major opcode of failed request:  149 (RANDR)
  Minor opcode of failed request:  15 (RRGetOutputProperty)
  Serial number of failed request:  20
  Current serial number in output stream:  20
root@a20-OLinuXino:/home/olimex#

[Insomniac10102]

Hi Adam,

Try running xrandr without any arguments. It should list all outputs. Is there an HDMI-0 or something? If so, try that in place of screen 0

[Adam]

This is the output of command "xrandr" without paramters:

Code Select Expand


root@a20-OLinuXino:/home/olimex# xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1280 x 720, current 1280 x 720, maximum 1280 x 720
default connected 1280x720+0+0 0mm x 0mm
   1280x720       50.0*
root@a20-OLinuXino:/home/olimex#


[Adam]

Does anybody have some more hints?

[JohnS]

If you've googled about xrandr widely and can't solve it I'd grab its source code and see what it does / add debug code.

John