Remove cursor from LCD

argeebee

On our AM335x design, a black block repeatedly redraws itself at the same position even though my program fills the frame buffer with white. The screen is completely white for a 1sec, then the black block redraws at the same spot again. The root file system is based on the basic filesystem from SDK 05.07.00.00, arago-base-tisdk-image-am335x-evm.tar.gz, so there is no X or QT libs. I've looked in the frame buffer kernel config options and didn't find anything.

I'm guessing that it is a cursor of some sort. If anyone has any ideas of how to get rid of it or where to investigate further, I'd appreciate it. Thanks in advance.

over 10 years ago

0 nikunj.rudani over 10 years ago

Expert 1990 points

try this:

echo 0 > /sys/class/graphics/fbcon/cursor_blink


best luck

0 Clemens Ladisch over 10 years ago

Guru 281620 points

Add a kernel parameter like vt.cur_default=1 or vt.global_cursor_default=0.

(I don't know if that kernel is new enough to have all these parameters.)

0 argeebee over 10 years ago in reply to Clemens Ladisch

Intellectual 835 points

Thanks for the replies! I got rid of the cursor, but something else seems to be drawing several blank lines across the LCD after a simple menu is loaded. No QT or X is used, just a custom program that writes the frame buffer. I tried to disable Framebuffer console in the kernel, which resulted in a blank screen that doesn't update despite running my custom program.

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Remove cursor from LCD