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-   -   LCD on arm-linux blanks after 10 minutes (http://www.linuxquestions.org/questions/linux-embedded-and-single-board-computer-78/lcd-on-arm-linux-blanks-after-10-minutes-787013/)

knighttof3 02-04-2010 10:59 AM

LCD on arm-linux blanks after 10 minutes
 
Hi,
My LCD screen goes blank after 10 minutes (exactly), and never comes back on. I would like for it to never go blank.
I am running Linux 2.6.27 on Atmel 9261. The LCD is LG-Philips LB035Q02. I am using the framebuffer console in text mode only (no X). Linux console is via serial /dev/ttyS0, but I can output characters on the LCD, e.g. echo "ABCD" > /dev/tty0. Shell is busybox.
A few selected .config options are given below.
I would include any additional information but at this point I don't know what would be relevant. Please ask as needed.


# Power management options
#
CONFIG_PM=y
CONFIG_PM_DEBUG=y
# CONFIG_PM_VERBOSE is not set
# CONFIG_SUSPEND is not set
# CONFIG_APM_EMULATION is not set
CONFIG_ARCH_SUSPEND_POSSIBLE=y
CONFIG_NET=y
#
# Graphics support
#
# CONFIG_VGASTATE is not set
# CONFIG_VIDEO_OUTPUT_CONTROL is not set
CONFIG_FB=y
# CONFIG_FIRMWARE_EDID is not set
# CONFIG_FB_DDC is not set
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_IMAGEBLIT=y
# CONFIG_FB_CFB_REV_PIXELS_IN_BYTE is not set
# CONFIG_FB_SYS_FILLRECT is not set
# CONFIG_FB_SYS_COPYAREA is not set
# CONFIG_FB_SYS_IMAGEBLIT is not set
CONFIG_FB_FOREIGN_ENDIAN=y
CONFIG_FB_BOTH_ENDIAN=y
# CONFIG_FB_BIG_ENDIAN is not set
# CONFIG_FB_LITTLE_ENDIAN is not set
# CONFIG_FB_SYS_FOPS is not set
# CONFIG_FB_SVGALIB is not set
# CONFIG_FB_MACMODES is not set
# CONFIG_FB_BACKLIGHT is not set
CONFIG_FB_MODE_HELPERS=y
# CONFIG_FB_TILEBLITTING is not set

#
# Frame buffer hardware drivers
#
# CONFIG_FB_S1D15605 is not set
# CONFIG_FB_S1D13XXX is not set
CONFIG_FB_ATMEL=y
# CONFIG_FB_INTSRAM is not set
# CONFIG_FB_ATMEL_STN is not set
# CONFIG_FB_VIRTUAL is not set
CONFIG_BACKLIGHT_LCD_SUPPORT=y
CONFIG_LCD_CLASS_DEVICE=y
# CONFIG_LCD_LTV350QV is not set
# CONFIG_LCD_ILI9320 is not set
# CONFIG_LCD_VGG2432A4 is not set
# CONFIG_LCD_PLATFORM is not set
CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_ATMEL_LCDC=y
# CONFIG_BACKLIGHT_CORGI is not set

#
# Display device support
#
# CONFIG_DISPLAY_SUPPORT is not set

#
# Console display driver support
#
# CONFIG_VGA_CONSOLE is not set
CONFIG_DUMMY_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE=y
# CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY is not set
# CONFIG_FRAMEBUFFER_CONSOLE_ROTATION is not set
CONFIG_FONTS=y
CONFIG_FONT_8x8=y
CONFIG_FONT_8x16=y
# CONFIG_FONT_6x11 is not set
# CONFIG_FONT_7x14 is not set
# CONFIG_FONT_PEARL_8x8 is not set
# CONFIG_FONT_ACORN_8x8 is not set
# CONFIG_FONT_MINI_4x6 is not set
CONFIG_FONT_SUN8x16=y
CONFIG_FONT_SUN12x22=y
CONFIG_FONT_10x18=y
CONFIG_LOGO=y <-- And I do see the Linux penguin but that's not X is it?

ravi_chobey 02-06-2010 03:19 AM

Please check your framebuffer source code.As i was also facing the same problem and i have made some changes in framebuffer source code.In my case
i was running my LCD ON GPIO pins and some GPIO related pins were in OFF case.That's why i my LCD was getting off after 15 minutes.Please check it.

Regards,
Ravi


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