S3 standby support removed from BIOS in recent Dell laptops

reddit.com

3 points·gattr··2 comments

Thinkpad X1 gen 6 did this as well, but in about a year Lenovo re-added it.

It was a nightmare for Linux users and was my first go at ACPI table patching for my wife's laptop.

I wonder what will Dell do with their Ubuntu laptops?

The Reddit thread suggests making Windows Registry changes to re-enable S3; however, in the latest laptops S3 is no longer even advertised by the BIOS. Just as in my December Inspiron 7506 - I got suspicious when, after putting to sleep, the fan would randomly turn on for a short time, and the laptop would stay warm. After some digging it turned out S3 is not available at all (i.e., under Fedora cat /sys/power/mem_sleep returns only [s2idle], and not deep.)

There are justifications floating around such as "certain devices/Windows drivers don't handle wake-up properly" or "CPU idle states are not re-enabled on wake-up", but still, I would like to have the option of deep sleep mode and just deal with any HW problems at my own risk. The "always connected" sleep functionality is of no importance/use to me at all.

Too bad, as I really like the build & screen quality on this model, and I guess I'll just get used to turning it off (which is not terrible, booting up takes only a few seconds.)

Reply on news.ycombinator.com