i.MX ProcessorsのトピックRe: Disable screen blanking on i.MX6 running Yocto

Disable screen blanking on i.MX6 running Yocto

marlonsmith — Fri, 15 Aug 2014 18:15:38 GMT

Hi everyone,

I'm running a Yocto build on an i.MX6 board and I'm trying to stop the screen from shutting off after 15 minutes of inactivity. I've tried the following things with no success:

- passing consoleblank=0 to bootargs

- modifying drivers/tty/vt/vt.c with static int blankinterval = 0;

Neither of these has had any effect.

cat /sys/module/kernel/parameters/consoleblank returns a value of 900.

My system does not have setterm.

Please help!

Thanks

Marlon

Re: Disable screen blanking on i.MX6 running Yocto

Yuri — Mon, 18 Aug 2014 00:18:31 GMT

Please try the following :

echo -e -n '\033[9]' > /dev/tty0

echo 0 > /sys/class/graphics/fbx/blank

fbx - is number of framebuffer (LCD, LVDS, HDMI), x =0,1,2

Have a great day,
Yuri

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Re: Disable screen blanking on i.MX6 running Yocto

marlonsmith — Mon, 18 Aug 2014 17:06:45 GMT

Thanks for the response Yuri!

I forgot that I had also already tried echo 0 > /sys/class/graphics/fbx/blank, but I will try echo -e -n '\033[9]' > /dev/tty0 and see if that works.

Re: Disable screen blanking on i.MX6 running Yocto

marlonsmith — Tue, 19 Aug 2014 19:29:27 GMT

Yuri, I've tried both of your suggestions and neither of them is working. The screen still goes blank after 15 minutes.

Any other ideas?

Thanks!

Marlon

Re: Disable screen blanking on i.MX6 running Yocto

Yuri — Fri, 22 Aug 2014 06:04:29 GMT

Please try using command "echo 0 > /sys/class/graphics/fb0/blank" under root.

~Yuri.

Re: Disable screen blanking on i.MX6 running Yocto

marlonsmith — Fri, 22 Aug 2014 18:25:40 GMT

Yuri, if I run that command after the screen has shut off, it does turn the screen back on. So it seems I'm on the right track. However when I run the command in a script on startup it does not seem to prevent the screen from blanking eventually. Any thoughts?

Re: Disable screen blanking on i.MX6 running Yocto

Yuri — Mon, 25 Aug 2014 04:54:58 GMT

Marlon,

Perhaps the problem concerns with the fact, that the mentioned command(s) should be

issued, when all Linux sub-systems are working. As a solution, one can run (own) special

application (at start up), which should issue the command ("echo 0 > /sys/class/graphics/fb0/blank")

after some period of time (several munutes).

~Yuri.

Re: Disable screen blanking on i.MX6 running Yocto

marlonsmith — Wed, 03 Sep 2014 17:50:04 GMT

Thanks for the help Yuri. What finally solved the problem was calling

echo -e '\033[9;0]' > /dev/tty1

from within my application, which runs once the rest of the system has been started.

Marlon