Re: [yocto] How to disable a linux virtual terminal...

2017-12-18 Thread Mirza Krak 
2017-12-14 22:51 GMT+01:00 Greer, Charles (ext) :
> Hi all,
>
>
>
> Would anyone know how to disable the virtual terminals in linux?  I am using
> Yocto, Morty version on an i.MX6 processor.  Even though our base
> distribution is Yocto, unfortunately we have diverged from building it with
> recipes, so this is more of a straight linux question than Yocto…
>
>
>
> To give some detail as to my problem:  It is for an embedded device that has
> an HDMI port - when I attach a terminal to the HDMI port it shows the Linux
> Penguin logo, a getty service and blanks out after 600 seconds.  I just want
> to use the hdmi port as an output with nothing displayed on the output and I
> want it to stay on all the time.
>
>
>
> I have found that the hdmi port maps to /dev/tty1 – when I type:  echo
> “asdfasdf” > /dev/tty1 I see the characters output to the monitor.
>
>
>
> Here are a few things I have tried to no avail – a lot of these are not
> needed if I can figure out how to disable it as a virtual terminal…
>
>
>
> · I figured out how to disable the getty service but a cursor still
> blinks.   I don’t even want a cursor to show

Normally you disable the cursor with a kernel argument:

vt.global_cursor_default=0

You probably also need to remove "console=tty1" from kernel arguments
to avoid to getting "boot prints"

< snip >

> Disabling the logo or console blanking would not be necessary if I could
> just figure out how to disable that port as a terminal…
>
>
>
> So does anyone have pointers or things I could try?  I am relatively new
> (returning after 10 years - I worked with DNX 10 years ago v2.6 and it seems
> everything I knew about init is fairly obsolete lol) to linux so I am sure I
> am missing a lot…

Well it sounds to me that you would like to disable the framebuffer
console completely.

Removing (=n) the

CONFIG_FRAMEBUFFER_CONSOLE

config should definitely get rid of most of the things that you
mentioned. But normally you would not disable it completely if you
would like to display a "boot screen" / splashscreen but if you do not
want it you can safely remove that option.

-- 
Med Vänliga Hälsningar / Best Regards

Mirza Krak
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Re: [yocto] How to disable a linux virtual terminal...

2017-12-14 Thread Andre McCurdy 
On Thu, Dec 14, 2017 at 1:51 PM, Greer, Charles (ext)
 wrote:
> Hi all,
>
> Would anyone know how to disable the virtual terminals in linux?  I am using
> Yocto, Morty version on an i.MX6 processor.

Try adding:

  USE_VT = "0"

to your machine config file.
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[yocto] How to disable a linux virtual terminal...

2017-12-14 Thread Greer, Charles (ext) 
Hi all,

Would anyone know how to disable the virtual terminals in linux?  I am using 
Yocto, Morty version on an i.MX6 processor.  Even though our base distribution 
is Yocto, unfortunately we have diverged from building it with recipes, so this 
is more of a straight linux question than Yocto...

To give some detail as to my problem:  It is for an embedded device that has an 
HDMI port - when I attach a terminal to the HDMI port it shows the Linux 
Penguin logo, a getty service and blanks out after 600 seconds.  I just want to 
use the hdmi port as an output with nothing displayed on the output and I want 
it to stay on all the time.

I have found that the hdmi port maps to /dev/tty1 - when I type:  echo 
"asdfasdf" > /dev/tty1 I see the characters output to the monitor.

Here are a few things I have tried to no avail - a lot of these are not needed 
if I can figure out how to disable it as a virtual terminal...


* I figured out how to disable the getty service but a cursor still 
blinks.   I don't even want a cursor to show



* I have tried to disable the display of the penguins  by disabling the 
LOGO in the kernel config parameters:
#CONFIG_LOGO=y
#CONFIG_LOGO_LINUX_MONO=y
#CONFIG_LOGO_LINUX_VGA16=y
#CONFIG_LOGO_LINUX_CLUT224=y

To no avail.  The logo still shows ::( .


* The fact that it blanks after 600 seconds is console blanking - I can 
see it set to 600 in the file:  /sys/module/kernel/parameters/consoleblank.  
When I issue the command:  echo -e '\033[9;0]'>/dev/tty1

It sets the console blanking to 0 and wakes the terminal.  Being able to wake 
the console up is limited success but I would like to disable the virtual 
terminal altogether...


* I tried commenting out these virtual terminal defines in the config 
file to no avail:
#CONFIG_VT=y
#CONFIG_VT_CONSOLE=y
#CONFIG_VT_CONSOLE_SLEEP=y
#CONFIG_HW_CONSOLE=y
#CONFIG_VT_HW_CONSOLE_BINDING=y


Everything I have read suggests that /dev/tty1 is a virtual terminal or 
console.  From what I read about the VT option, disabling the CONFIG_VT should 
do it:

VT - Virtual terminal

Say yes here to get support for terminal devices with display and keyboard 
devices. These are called "virtual" because you can run several virtual 
terminals (also called virtual consoles) on one physical terminal.

You need at least one virtual terminal device in order to make use of your 
keyboard and monitor. Therefore, only people configuring an embedded system 
would want to say no here in order to save some memory; the only way to log 
into such a system is then via a serial or network connection.

Virtual terminals are useful because, for example, one virtual terminal can 
display system messages and warnings, another one can be used for a text-mode 
user session, and a third could run an X session, all in parallel. Switching 
between virtual terminals is done with certain key combinations, usually 
Alt-function key.

If you are unsure, say yes, or else you won't be able to do much with your 
Linux system.
But for some reason it doesn't do anything!


* I found this thread;  
https://askubuntu.com/questions/357039/how-do-i-disable-virtual-consoles-tty1-6.
  But it is not much help since my distribution does not have any of the 
directories in the solutions offered in this thread.  For instance I do not 
have a /etc/events.d nor do I have a /etc/default/console-setup file nor do I 
have a /etc/init directory...   I imagine the reason for this is that my 
distribution uses systemd and the solutions are SysV based init maybe?

Disabling the logo or console blanking would not be necessary if I could just 
figure out how to disable that port as a terminal...

So does anyone have pointers or things I could try?  I am relatively new 
(returning after 10 years - I worked with DNX 10 years ago v2.6 and it seems 
everything I knew about init is fairly obsolete lol) to linux so I am sure I am 
missing a lot...
Thanks,

-  Chuck

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