systemd: add RemainAfterExit and ExecStop

[jpkotta]

With this .service file, the battery charge limits can be reset to the default if the service is stopped.

[teleshoes]

cool, thanks. however, SP default is 0, not 100.
{i suspect that the default value it uses internally when you do "-s SP 0" is actually around 95%, and that "-s SP 100" might forcibly override this and cause it to charge more than it would. dunno tho, maybe 100 actually does have the same effect as 0, but 0 is still what the default actually is}

[linrunner]

Imho Lenovo factory defaults are always ST 96 / SP 100. TLP in fact uses this assumption when converting the values for displaying or writing.

[teleshoes]

eh, im not being very clear. the lenovo acpi interface has a value that means 'use default stop threshold'.
that default-value happens to be "0", and not "100".

so, if you are correct, linrunner, then "tpacpi-bat -s SP 100" should have the same effect as "tpacpi-bat -s SP 0", unless there is a BIOS version that does not default to 100. {though i suspect this is not the case, and that SP=100 is the same as SP=0 for all thinkpads and BIOSes}

so, in conclusion "100" is the WRONG value to set SP to for 'default', and "0" is the CORRECT value to set SP to for 'default'. HOWEVER, it is quite likely {and irrelevant} that both will behave the same.

[teleshoes]

also, linrunner, i suggest you use ST=0 and SP=0 when actually setting the default-values in TLP, instead of 96 and 100. {the BIOS may use isDefault() to perform different behaviours under certain circumstances.}

for displaying, it makes sense to show ST=96% and SP=100%, though you should probably differentiate between explicit and implicit default {e.g.: 96 => "START: 96%" vs 0 => "START: 96% {default}"}

[linrunner]

My posting was misleading. I fully understand your suggestions and TLP implements them since the beginning with tpacpi-bat – with the exception that TLP doesn't accept 0 as input for default. I'll think about that too.