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I am a very basic Ubuntu user. Everytime I am trying the terminal, I receive the following question and I do not know how to answer: Do you have full superuser (root) permissions? I want to configure the TV at home to send video via HDMI port. When I write "get-edid", the question appears. y, yes or -y do not work. I am the root and know the password.

I would like to learn how to say "yes" on Ubuntu?

Thank you in advance.


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Please edit your question and explain what you do when this happens and the message itself. – user54813 Jan 12 '13 at 18:25
Thanks but the only information I can give is this much. What is nouveau driver? Or are you just speaking French? – Miraç Gül Jan 12 '13 at 18:35
But I have a RADEON HD 4200. – Miraç Gül Jan 12 '13 at 18:41
You should try sudo get-edid. – Eric Carvalho Jan 12 '13 at 18:41
No need. Accepting the question will make it disappear from the frontpage. The website will once every so often put questions with no answer back to the frontpage (and will ignore accepted ones) – Rinzwind Jan 12 '13 at 18:54
up vote 4 down vote accepted

You need sudo in front of the command get-edid. You are accessing hardware so it will need to issue commands that a normal user can not use.


get-edid | parse-edid

will give ...

mmap /dev/zero: Operation not permitted
get-edid: error initialising realmode interface
get-edid: do you have full superuser (root) permissions?

because the mmap /dev/zero needs root permissions.

sudo get-edid | parse-edid

will show something similar to...

Performing real mode VBE call
Interrupt 0x10 ax=0x4f00 bx=0x0 cx=0x0
Function supported
Call successful


share|improve this answer
Thanks a lot! So I got the answer. – Miraç Gül Jan 12 '13 at 18:49
no problem! Glad to be able to help @MiraçGül :) – Rinzwind Jan 12 '13 at 18:50

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