vbetool dpms /dev/mem operation not permittet

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vbetool dpms /dev/mem operation not permittet

Postby longhtran » 2020-08-19 03:33

My laptop is installed Debian from this image http://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/current/amd64/iso-cd/firmware-10.5.0-amd64-netinst.iso. During the installation, I only choose SSH and Utilities (no Desktop Environment). I run the following command under root user to turn off the screen
Code: Select all
vbetool dpms off


However, I run to this error
Code: Select all
open /dev/mem: Operation not permitted
Failed to initialise LRMI (Linux Real-Mode Interface)


Anybody can help me with that?
longhtran
 
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Joined: 2020-08-19 03:24

Re: vbetool dpms /dev/mem operation not permittet

Postby Head_on_a_Stick » 2020-08-19 07:22

longhtran wrote:
Code: Select all
Failed to initialise LRMI (Linux Real-Mode Interface)

^ I put this into the search box at startpage.com and this was the top result:

https://bugs.launchpad.net/ubuntu/+sour ... ug/1875240

Does that help?

Next time please search the error message before opening a thread.
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Re: vbetool dpms /dev/mem operation not permittet

Postby longhtran » 2020-08-19 12:44

Head_on_a_Stick wrote:
longhtran wrote:
Code: Select all
Failed to initialise LRMI (Linux Real-Mode Interface)

^ I put this into the search box at startpage.com and this was the top result:

https://bugs.launchpad.net/ubuntu/+sour ... ug/1875240

Does that help?

Next time please search the error message before opening a thread.

Thanks for the post. I have already looked at that. It is not actually the same error

Code: Select all
sudo mount -o remount,exec /dev
vbetool dpms off

give me the same error

Code: Select all
sudo setsebool -P mmap_low_allowed
vbetool dpms off

same error and I read that this is not a recommended since root can be compromised
longhtran
 
Posts: 2
Joined: 2020-08-19 03:24


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