Steve, you are executing echo as root but not writing to /sys/power/mem_sleep at root. Try switching to a root shell (sudo su) first. To make the workaround permanent, you can rely on systemd- tmpfiles to write the "deep" by creating a file /etc/tmpfiles.d/mem_sleep.conf containing:
# Path Mode UID GID Age Argument w /sys/power/mem_sleep - - - - deep -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1860390 Title: Dell XPS 13 (9360) defaults to s2idle sleep/suspend instead of deep (suspend to ram) Status in linux package in Ubuntu: Confirmed Bug description: This is a reintroduction of https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1808957 which I am experiencing with Ubuntu 20.04 fully upgraded on a Dell XPS 13 9360. This did not happen before in Ubuntu 19.04 nor in Ubuntu 19.10 (Eoan), so this issue is affecting Ubuntu kernels >= 5.4. It seems that the Dell 9360 is set to go into s2idle mode rather than deep sleep, forgoing significant power savings. I have confirmed this by suspending and then checking: sudo journalctl | grep "PM: suspend" | tail -2. If the output is PM: suspend entry (s2idle) PM: suspend exit cat /sys/power/mem_sleep showed [s2idle] deep As a temporary fix, I typed echo deep > /sys/power/mem_sleep as a root user (sudo -i). Then the output of cat /sys/power/mem_sleep was s2idle [deep] After suspending now, sudo journalctl | grep "PM: suspend" | tail -2 returns PM: suspend entry (deep) PM: suspend exit I have made this permanent by editing /etc/default/grub and replacing GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" with GRUB_CMDLINE_LINUX_DEFAULT="quiet splash mem_sleep_default=deep" then regenerating my grub configuration (sudo update-grub). --- ProblemType: Bug AlsaVersion: Advanced Linux Sound Architecture Driver Version k5.4.0-9-generic. ApportVersion: 2.20.11-0ubuntu15 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC3246 Analog [ALC3246 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: user 1570 F.... pulseaudio Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xdc228000 irq 131' Mixer name : 'Realtek ALC3246' Components : 'HDA:10ec0256,1028075b,00100002 HDA:8086280b,80860101,00100000' Controls : 55 Simple ctrls : 17 CurrentDesktop: GNOME DistroRelease: Ubuntu 20.04 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 8087:0a2b Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Lsusb-t: /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M |__ Port 3: Dev 2, If 0, Class=Wireless, Driver=btusb, 12M |__ Port 3: Dev 2, If 1, Class=Wireless, Driver=btusb, 12M MachineType: Dell Inc. XPS 13 9360 Package: linux (not installed) ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-5.4.0-9-generic root=UUID=be0fafa9-2c93-4717-bc39-06d8bbf0a232 ro rootflags=subvol=@ resume=UUID=9b786c9e-5b9c-4651-bc7a-85faf191166c quiet splash i915.enable_psr=2 i915.enable_fbc=1 i915.enable_psr=2 i915.enable_fbc=1 mem_sleep_default=deep vt.handoff=7 ProcVersionSignature: Ubuntu 5.4.0-9.12-generic 5.4.3 RelatedPackageVersions: linux-restricted-modules-5.4.0-9-generic N/A linux-backports-modules-5.4.0-9-generic N/A linux-firmware 1.184 Tags: focal Uname: Linux 5.4.0-9-generic x86_64 UnreportableReason: This report is about a package that is not installed. UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: cdrom lp lpadmin plugdev sudo WifiSyslog: _MarkForUpload: False dmi.bios.date: 11/14/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 2.13.0 dmi.board.name: 04N87K dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr2.13.0:bd11/14/2019:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn04N87K:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.family: XPS dmi.product.name: XPS 13 9360 dmi.product.sku: 075B dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1860390/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
