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Dell Latitude 5420 / 5520 S3 Suspend (deep sleep) not working on Ubuntu 21.04
Hello,
I just purchased the latest Latitude 5420 and I cannot get suspend to RAM working. I use Ubuntu 21.04 with kernel 5.11. dmesg shows there is no S3 supported:
# dmesg | grep ACPI | grep support
[ 1.423483] ACPI: (supports S0 S4 S5)
In BIOS I have Sleep S3 specifically unblocked (I also tried to change it to ON):
I also tried to add mem_sleep_default=deep to GRUB kernel boot options and also to force via command line, but mem_sleep file is not editable:
$ cat /sys/power/mem_sleep
[s2idle]
$ echo deep | sudo tee /sys/power/mem_sleep
deep
tee: /sys/power/mem_sleep: Invalid argument
When suspending (via systemctl suspend or from GNOME menu -> Suspend) I see it goes to s2idle always instead:
[ 1144.616225] PM: suspend entry (s2idle)
I tried everything I could find on the Internet but I cannot get it to go to deep sleep.
VinceFR33
1 Message
1
August 23rd, 2022 23:00
I have the same problem with Latitude 5530.
One flag in the BIOS will solve this issue. It's not a big deal for DELL.
It does not matter, every year I will ask them for a new battery, I have a 3 year warranty.
When I buy a Dell product I expect evolution not regression.
Amazing this story. I am disappointed with DELL.