I'm opening a thread in this forum and I hope it is the right place to ask for help.
I've been searching information around the web regarding the different available states a machine could have for suspending the system (acpi). At the moment, I'm owning a Latitude 5420 (see probe https://linux-hardware.org/?probe=1356be4391) running Debian 10 with kernel 5.10. When I use systemctl suspend it does suspend but it drains my battery overnight to 10-20%.
When I read /sys/power/mem_sleep file, this is the output I get :
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sudo cat /sys/power/mem_sleep
[s2idle]
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sudo echo deep >> /sys/power/mem_sleep
bash: /sys/power/mem_sleep: Permission denied
echo deep >> /sys/power/mem_sleep
-bash: echo: write error: Invalid argument
If you need further output from different commands I'll be glad to provide.
Thanks in advance!