PiBox » Xeon

Look to drivers/power/supply/rk818_battery.c, and especially check if there is an updated kernel available. This may already be fixed.

1. https://github.com/torvalds/linux/blob/96ae6c2ea090e55425dc276e11e65f88b6964a42/drivers/power/supply/rk818_battery.c#L2443 (from old commit)
2. https://megous.com/git/linux/tree/drivers/power/supply/rk818_battery.c?h=orange-pi-6.6&id=6fa0d75ad544046dff9b29a721efc60c0b43cf1e#n2437 (megi's kernel repo)

Experimented with this a bit. Setting loglevel=6 reduces console output considerably and also gets rid of the rk818-bat message. However, I want all those other messages, just not the rk818-bat message.

So I would probably want to patch the kernel driver to disable this. Since BAT_INFO() is used throughout the driver, and I only want to quiet the power changed message that pops up on the console repeatedly, I can just #if 0 the block of code. An alternative would be to add a sysfs entry to enable or disable it.

There is already a sysfs setup in rk818_bat_init_sysfs() that uses rk818_bat_attr[] which is a set of sysfs files/functions to enable. Currently the only sysfs function is bat_info_store() but it should be easy to convert rk818_bat_power_supply_changed() info a function that stuffs new values into module variables that can be queried from user space.

For now, just know that the message can be stopped by setting loglevel=6 in the boot.txt file. I'll consider submitting a patch for the driver later.