On me system (9300 that came with Ubuntu) I had to do the following changes :
BIOS, turn off Early Logo Display to OFF in the Sign of Life options
BIOS, disable Secure Boot
In the system, edit and configure in /etc/default/grub to add to the kernel options : mem_sleep_default=deep
My current kernel options are : GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mitigations=off mem_sleep_default=deep"
(do NOT use mitigations=off unless you seriously know what you're doing)
Reboot. TO check if the deep sleep is on :
cat /sys/power/mem_sleep
Should return :
s2idle [deep]
The deep here confirms the deep sleep mode is turned on.
On my 9300 I can close the lid at 100 % and after a full day of sleep, I will be at 99 or 98 % of battery at the end of the day.
I did not edit the /etc/systemd/sleep.conf file at all. The kernel option is enough.
Note : after the 9300 model Dell has broken the deep sleep and it's no longer available in the UEFI table so there's no way to turn on deep sleep on those models. The 9300 is the last model where the deep sleep works properly. Which also means my next laptop is a X Carbon from another brand.
Dell, you lost a customer that spent 3000 euro per year to another brand. Congratulations.
GilAverbuch
1 Message
0
July 14th, 2021 13:00
I have the same problem. Still didn't find a solution. It seems that the deep sleep mode is not available.
Gilbou92
1 Rookie
•
77 Posts
0
January 21st, 2022 13:00
On me system (9300 that came with Ubuntu) I had to do the following changes :
BIOS, turn off Early Logo Display to OFF in the Sign of Life options
BIOS, disable Secure Boot
In the system, edit and configure in /etc/default/grub to add to the kernel options : mem_sleep_default=deep
My current kernel options are : GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mitigations=off mem_sleep_default=deep"
(do NOT use mitigations=off unless you seriously know what you're doing)
Reboot. TO check if the deep sleep is on :
cat /sys/power/mem_sleep
Should return :
s2idle [deep]
The deep here confirms the deep sleep mode is turned on.
On my 9300 I can close the lid at 100 % and after a full day of sleep, I will be at 99 or 98 % of battery at the end of the day.
I did not edit the /etc/systemd/sleep.conf file at all. The kernel option is enough.
Note : after the 9300 model Dell has broken the deep sleep and it's no longer available in the UEFI table so there's no way to turn on deep sleep on those models. The 9300 is the last model where the deep sleep works properly. Which also means my next laptop is a X Carbon from another brand.
Dell, you lost a customer that spent 3000 euro per year to another brand. Congratulations.