Fairly recent high battery use

Light use on my laptop has always given me around 3.5hrs on a full charge with mildly loaded system. Recently this has dropped to a little over 2hrs. I thought maybe it’s the age of the laptop and the battery getting towards end of life as it is fairly old and I very rarely run off the battery, which I hear isn’t so good for Lithium batteries. Then the other day I had to do something using my Ubuntu partition (one particular software stopped working as expected in Manjaro, I think due to the 3rd party addons I use not being compatible with later versions) and it ran 3.5hrs quite happily. As you’ll see below inxi shows the battery as being at 100% health too. So it seems the battery probably isn’t actually the issue.

I can be fairly certain it is not the kernel version as I have a separate issue with later kernels so I am booting into the one I was using when I believe I had observed good battery life. I will try the one below it too (which is the oldest I have installed.) Tested with same programs running, WiFi disabled, made sure both are running Powersave mode in the CPU driver (which is the pstate driver in both instances as 5.4 is before the changes to this.)

(For completeness I’m running 5.4-rt as it mostly runs good. 5.9-rt gives me issues which caused me to revert to my previously installed kernel. I have tried 5.12-generic an 5.11-lqx but not tested the battery with them as they give me the same issue as 5.9-rt. I have 5.2-rt installed and will check how it performs on battery tomorrow (it’s quite late where I am so wont be able to today.)

$ inxi -Fxzc0
  Kernel: 5.4.106-rt54-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 
  Desktop: Xfce 4.16.0 Distro: Manjaro Linux base: Arch Linux 
  Type: Laptop System: Hewlett-Packard product: HP EliteBook 840 G2 
  v: A3009D410303 serial: <filter> 
  Mobo: Hewlett-Packard model: 2216 v: KBC Version 96.5B serial: <filter> 
  UEFI: Hewlett-Packard v: M71 Ver. 01.27 date: 07/12/2018 
  ID-1: BAT0 charge: 14.8 Wh (46.4%) condition: 31.9/31.9 Wh (100.0%) 
  volts: 12.7 min: 11.4 model: Hewlett-Packard Primary status: Charging 
  Info: Dual Core model: Intel Core i7-5500U bits: 64 type: MT MCP 
  arch: Broadwell rev: 4 cache: L2: 4 MiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 19166 
  Speed: 961 MHz min/max: 500/3000 MHz Core speeds (MHz): 1: 961 2: 856 
  3: 938 4: 952 
  Device-1: Intel HD Graphics 5500 
  vendor: Hewlett-Packard ZBook 15u G2 Mobile Workstation driver: i915 
  v: kernel bus-ID: 00:02.0 
  Display: x11 server: X.Org 1.20.11 driver: loaded: intel 
  resolution: 1920x1080~60Hz 
  OpenGL: renderer: Mesa Intel HD Graphics 5500 (BDW GT2) v: 4.6 Mesa 21.0.3 
  direct render: Yes 
  Device-1: Intel Broadwell-U Audio vendor: Hewlett-Packard 
  driver: snd_hda_intel v: kernel bus-ID: 00:03.0 
  Device-2: Intel Wildcat Point-LP High Definition Audio 
  vendor: Hewlett-Packard driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 
  Sound Server-1: ALSA v: k5.4.106-rt54-MANJARO running: yes 
  Sound Server-2: sndio v: N/A running: no 
  Sound Server-3: JACK v: 1.9.18 running: yes 
  Sound Server-4: PulseAudio v: 14.2 running: yes 
  Sound Server-5: PipeWire v: 0.3.26 running: no 
  Device-1: Intel Ethernet I218-LM vendor: Hewlett-Packard driver: e1000e 
  v: 3.2.6-k port: 5080 bus-ID: 00:19.0 
  IF: enp0s25 state: down mac: <filter> 
  Device-2: Intel Wireless 7265 driver: iwlwifi v: kernel port: ef80 
  bus-ID: 03:00.0 
  IF: wlo1 state: up mac: <filter> 
  Local Storage: total: 3.64 TiB used: 2.87 TiB (79.0%) 
  ID-1: /dev/sda vendor: Samsung model: SSD 850 EVO 4TB size: 3.64 TiB 
  ID-1: / size: 59.83 GiB used: 38.23 GiB (63.9%) fs: ext4 dev: /dev/sda3 
  ID-2: /boot/efi size: 496 MiB used: 49.9 MiB (10.1%) fs: vfat 
  dev: /dev/sda1 
  ID-1: swap-1 type: partition size: 15.26 GiB used: 0 KiB (0.0%) 
  dev: /dev/sda5 
  System Temperatures: cpu: 50.0 C mobo: 0.0 C 
  Fan Speeds (RPM): N/A 
  Processes: 209 Uptime: 1h 40m Memory: 15.04 GiB used: 2.55 GiB (16.9%) 
  Init: systemd Compilers: gcc: 10.2.0 Packages: 2113 Shell: Bash v: 5.1.0 
  inxi: 3.3.04 
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Sorry busy Sunday then been feeling rather poorly since so hadn’t managed to come back here.

5.2 kernel does give me good battery consumption so this is being caused by 5.4. Lucky I caught it in time to mark 5.2 as explicitly installed so it’s not removed at next update. Guess it may have something to do with why 5.7 brought in the new CPU driver (although no actual evidence of this.)

Unfortunately 5.2 does have a bug than causes my laptop to fail to boot on occasion, maybe one time in ten (freezes with last line saying it’s performing clean so wonder if it’s to do with fstrim/clean at boot. It’s been like this since I first installed Manjaro which I think was around 4.12 and everything seems fine on forcing reboot so I’ve never really worried about it and not going to start now. Until I went back to 5.2 I had kinda missed that it seemed to be fixed running 5.4 though…