Tejas SJ

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  1. Hardware setup :: Olimex Lime 2 Rev.k + 7" LCD + 5V power supply through the power jack. No battery is connected to the lime 2 board. Problem :: when the board boots up, the xfce power manager shows that the Battery is connected and it's in charging mode. The current charge value of the battery changes randomly like 92%, 56% and etc. When it reaches 0% the board will shut down. It completes the shut down procedure. The following is the terminal output, to find the battery status. Even though the battery is not connected you can observe that it returns the Voltage and reports that the battery is present root@olinuxino:~# cat /sys/class/power_supply/axp20x-battery/voltage_now 2865000 root@olinuxino:~# cat /sys/class/power_supply/axp20x-battery/present 1 root@olinuxino:~# cat /sys/class/power_supply/axp20x-battery/online 1 root@olinuxino:~# cat /sys/class/power_supply/axp20x-battery/capacity 0 root@olinuxino:~# cat /sys/class/power_supply/axp20x-battery/capacity 0 root@olinuxino:~# cat /sys/class/power_supply/axp20x-battery/online 1 root@olinuxino:~# cat /sys/class/power_supply/axp20x-battery/voltage_now 2879000 root@olinuxino:~# [ OK ] Stopped Unattended Upgrades Shutdown. [ OK ] Stopped target Timers. [ OK ] Stopped target Sound Card. ..... ..... ..... The board shut down as soon as the capacity reached 0%. I have three Lime 2 Rev.K boards, the behaviour is seen in all. What could be the reason for this behavior? Should I disable xfce power manager? What are the other problems with disabling xfce power manager? Can you please tell me the steps to disable the xfce4-power-manager. Note : I am using the Armbian_Ubuntu_bionic_5.1.12 OS with Lime 2 rev.K. It doesn't happen with Armbian_5.72.1 Debian_stretch. Attachments:: AXP209 Charging LED is ON - Even though the battery is not connected to the board, the charging LED is ON. The LED is not continuously ON, it blinks in random order. xfce4 Power manger - Image of xfce4 Power manger which shows that battery is connected even though its not physically connected.
  2. I am using Olimex Lime 2 Emmc Rev.k for a project. One of the Boards shuts down randomly. Its not a freeze or a sudden power down of the board. The board undergoes a complete shut down procedure. I checked the log entries in /var/log/syslog log file. There is a entry of board going to shut down but I couldn't find the reason for shut down. Is there a way to find out if the board got shut down because of the Power-button press, shutdown command from a SSH client, shutdown because of temperature or shutdown because of under voltage ? Is there a log file i can check to find the reason for shutdown?
  3. How to disable the Serial Console log in LCD during the U-Boot stage? I am using Lime2 Rev.K board "A20-OLinuXino-LIME2-e4Gs16M" with a 7" LCD. Image used is "Armbian_5.89 with Ubuntu bionic". There is a serial console log displayed on the LCD during the U-Boot stage which stays on for a brief period of less than 5 seconds.