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this post was submitted on 11 Oct 2023
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Do a "cat /sys/kernel/debug/pmc_core/package_cstate_show". You probably have figures for C2 and C3, and C6-C10 states are all zero. C10 is the golden S0ix state that you need for modern sleep.
I have a 13th gen intel Zenbook, and I spent a month fighting the same. My problem was that the bios setting for Intel VMD/Raid cockblocked sleep. If you have any bios options to disable that, or set storage to a more legacy mode, try it.
The Dell bug report that made my answer click
I check that C2 the only one has value when on battery.
Others are zero. Hmmm...
Check with powertop that runtime power manage is enabled for devices (tunables are "Good").
It looks like it has a RTL8111H for Ethernet, which is known to be problematic with sleep. My machines don't go below C3 due runtime power management being disabled for Ethernet, but enabling it causes it to fail to come out of suspend correctly.
All are good, still draining sadly :')