System76's Lemur Pro

Battery Charge Thresholds

The default 90-100 charge thresholds seem to quickly destroy the battery (causing it to swell greatly).

see https://support.system76.com/articles/laptop-battery-thresholds/

set 90/80 or lower?

  • system76_acpi module seems integrated into the mainline kernel now
  • charge thresholds can be manipulated (by 0-100 percent values) in 
          /sys/class/power_supply/BAT0/charge_control_end_threshold
      /sys/class/power_supply/BAT0/charge_control_start_threshold
  • post 2025/02 opencore firmware save thresholds across boots
  • XFCE power applet shows 'Full Charge' at 90% (when 90 is the end_threshold). But shows 90% if unplugged

    • Backlight

    This doesn't seem to be an issue anymore as of Xubuntu 24.10LTS

    After installing Xubuntu 22.04 LTS and system76's ppa, the following issue occured:

    When the screen turned on again after blanking, the backlight would come on at 100% brightness despite its setting before blanking.

    A discrepancy would then exist between /sys/class/backlight/intel_backlight/actual_brightness and /sys/class/backlight/intel_backlight/brightness.

    The fix was to modify the file /etc/defaults/grub to change 

      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    to 
      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=native"
    and regenerate the grub install.

    "acpi_backlight=vendor" as sometimes mentioned didn't work on this kernel, and removed the /sys/backlight directory.