i.MX ProcessorsのトピックRe: How do I prevent the LCD from turning off after 20 min ?

How do I prevent the LCD from turning off after 20 min ?

ottoblom — Thu, 01 May 2014 21:10:42 GMT

We have a LVDS LCD working using the imx_lbd driver, however it insists on turning off about 15 minutes after power-up. Any ideas on how to turn off this "feature" ? I have tried

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

echo 0 > /sys/class/graphics/fb0/blank

echo 0 > /sys/class/graphics/fb1/blank

echo 0 > /sys/class/graphics/fb2/blank

echo 0 > /sys/class/graphics/fb3/blank

and that did not help. We are using a i.MX6Q on the Linux 3.0.35-4.1.0 BSP. Gnome is not used

Any help would be appreciated

/Otto

Re: How do I prevent the LCD from turning off after 20 min ?

PeterChan — Fri, 02 May 2014 02:00:34 GMT

Hello Otto,

By default, the blank interval of a terminal is 10 minutes and the screen will automatically blank when the terminal has no activity after this interval.

You can goto the file "linux/drivers/tty/vt/vt.c" and change the static global "blankinterval" to 0 and then rebuild the kernel. Alternatively. if your build has added the "util-linux" package, you can use command "setterm -blank 0" to disable this feature.

Re: How do I prevent the LCD from turning off after 20 min ?

ottoblom — Fri, 02 May 2014 16:29:20 GMT

Excellent, thank you!

Re: How do I prevent the LCD from turning off after 20 min ?

isaac_ng — Sun, 04 May 2014 11:17:03 GMT

Hello Otto,

You could also refer to this link to add the bootargs to send to kernel to disable the auto blank.

Linux disable framebuffer auto blank by uboot bootargs

Regards, Isaac.

Re: How do I prevent the LCD from turning off after 20 min ?

ottoblom — Mon, 05 May 2014 16:31:14 GMT

That's good to know. Thanks Isaac !