Created attachment 168231 [details] ACPI dump from ElitePad 1000 G2 Hi, I'm attempting to run 3.19 on the HP ElitePad (BayTrail tablet platform). Everything appears to work properly, other than the battery status information reported in /sys. Regardless of whether the tablet is plugged in and charging or unplugged the output is always this: user@machine:~$ cat /sys/class/power_supply/BAT0/uevent POWER_SUPPLY_NAME=BAT0 POWER_SUPPLY_STATUS=Discharging POWER_SUPPLY_PRESENT=1 POWER_SUPPLY_TECHNOLOGY=Li-ion POWER_SUPPLY_CYCLE_COUNT=0 POWER_SUPPLY_VOLTAGE_MIN_DESIGN=7400000 POWER_SUPPLY_VOLTAGE_NOW=7400000 POWER_SUPPLY_CURRENT_NOW=100000 POWER_SUPPLY_CHARGE_FULL_DESIGN=3375000 POWER_SUPPLY_CHARGE_FULL=3375000 POWER_SUPPLY_CHARGE_NOW=2000000 POWER_SUPPLY_CAPACITY=59 POWER_SUPPLY_MODEL_NAME=PABAS0241231 POWER_SUPPLY_MANUFACTURER=HP POWER_SUPPLY_SERIAL_NUMBER=41167 This is the case for both Ubuntu 3.19 kernel, and self-compiled kernels, 3.18 and 3.19. I've tried the patch given in bug #90161 but it doesn't make any difference in this case. Not knowing how ACPI etc works I'm pretty stumped. The ACPI dump is attached. If somebody can point me in the right direction I'm happy to investigate further.
Does CONFIG_ACPI_I2C_OPREGION get set? I tested on ASUS T100, which is also a Baytrail-T platform on v4.0-rc6, it doesn't have this problem. But things may be different.
ping