Battery power monitor inaccurate

[jtkb]

Linux Mint 17.2 Rafaela 64-Bit

Battery power monitor is wildly inaccurate after upgrade from 17.1 to 17.2. Also there is no power-remaining percentage shown.

The power remaining indication also varies randomly for example, going from over 2 hours remaining to 30 minutes remaining in the space of a few minutes, before jumping back up another time-remaining estimate.

The laptop I have is an HP Envy 15 i5

dmidecode -t 22 reports:

# dmidecode 2.12
# SMBIOS entry point at 0x9ce7ef98
SMBIOS 2.7 present.

Handle 0x002D, DMI type 22, 26 bytes
Portable Battery
 Location: Primary
 Manufacturer: 12-42
 Manufacture Date: 01/01/2013
 Serial Number: SERIAL
 Name: PI06062
 Chemistry: Lithium Ion
 Design Capacity: 61993 mWh
 Design Voltage: 11100 mV
 SBDS Version: Not Specified
 Maximum Error: 0%
 OEM-specific Information: 0x00000000

dmidecode -t processor reports:

# dmidecode 2.12
# SMBIOS entry point at 0x9ce7ef98
SMBIOS 2.7 present.

Handle 0x0004, DMI type 4, 42 bytes
Processor Information
 Socket Designation: U3E1
 Type: Central Processor
 Family: Core i5
 Manufacturer: Intel(R) Corporation
 ID: C3 06 03 00 FF FB EB BF
 Signature: Type 0, Family 6, Model 60, Stepping 3
 Flags:
  FPU (Floating-point unit on-chip)
  VME (Virtual mode extension)
  DE (Debugging extension)
  PSE (Page size extension)
  TSC (Time stamp counter)
  MSR (Model specific registers)
  PAE (Physical address extension)
  MCE (Machine check exception)
  CX8 (CMPXCHG8 instruction supported)
  APIC (On-chip APIC hardware supported)
  SEP (Fast system call)
  MTRR (Memory type range registers)
  PGE (Page global enable)
  MCA (Machine check architecture)
  CMOV (Conditional move instruction supported)
  PAT (Page attribute table)
  PSE-36 (36-bit page size extension)
  CLFSH (CLFLUSH instruction supported)
  DS (Debug store)
  ACPI (ACPI supported)
  MMX (MMX technology supported)
  FXSR (FXSAVE and FXSTOR instructions supported)
  SSE (Streaming SIMD extensions)
  SSE2 (Streaming SIMD extensions 2)
  SS (Self-snoop)
  HTT (Multi-threading)
  TM (Thermal monitor supported)
  PBE (Pending break enabled)
 Version: Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz
 Voltage: 0.8 V
 External Clock: 100 MHz
 Max Speed: 2500 MHz
 Current Speed: 2500 MHz
 Status: Populated, Enabled
 Upgrade: <OUT OF SPEC>
 L1 Cache Handle: 0x0006
 L2 Cache Handle: 0x0007
 L3 Cache Handle: 0x0008
 Serial Number: To Be Filled By O.E.M.
 Asset Tag: To Be Filled By O.E.M.
 Part Number: To Be Filled By O.E.M.
 Core Count: 2
 Core Enabled: 2
 Thread Count: 4
 Characteristics:
  64-bit capable
  Multi-Core
  Hardware Thread
  Execute Protection
  Enhanced Virtualization
  Power/Performance Control

[jtkb (mint-b)]

similar bugs reported here : https://bugs.launchpad.net/linuxmint/+bug/1491502

and here :

https://bugs.launchpad.net/linuxmint/+bug/1489093

[jtkb (mint-b)]

I resolved the %'ge display as by default it is configured 'off' but it is still inaccurate and gives random and erratic readings.