Public bug reported:
Hardware: ASUS Vivobook 15 X1504ZA, Intel Core i5-1235U (Alder Lake-P),
Iris Xe graphics, Kingston NV3 1TB NVMe. BIOS X1504ZA.316 (latest).
OS: Ubuntu 26.04.1 LTS, kernels 7.0.0-38-generic and 7.0.0-42-generic.
Problem: during s2idle suspend the battery drains ~4%/hour
(59% -> 4% in ~13 h). The system never reaches S0ix.
Findings:
- /sys/kernel/debug/pmc_core/slp_s0_residency_usec stays at 0
after suspend; /sys/power/suspend_stats/last_hw_sleep = 0.
- With warn_on_s0ix_failures=Y the kernel reports
"CPU did not enter Package C10!!!"; only Package C2/C3 counters
increase. Package C6-C10 are always 0, both suspended and idle.
- Cores do reach C10 (~97% residency at idle via cpuidle).
- i915_dmc_info: DMC v2.20 loaded, "DC3 -> DC5 count: 4",
"DC5 -> DC6 count: 0". DC6 is never reached.
- eDP panel does not support PSR or Panel Replay
(i915_psr_status: "Sink support: PSR = no").
- MSR 0xE2 package C-state limit = 8 (not limited by BIOS).
- cpuidle driver: intel_idle; C6/C8/C10 enabled.
Already ruled out:
- NVMe: APST enabled, ASPM L1 active.
- Intel VMD enabled and disabled in BIOS: no change.
- Wi-Fi (CNVi) power save and radio off: no change.
- USB receivers unplugged: no change.
- powertop --auto-tune: no change.
- ltr_ignore for XHCI (4), ME (6), CNV (10) with Secure Boot
disabled: no change.
- HDMI audio power domains: use count 0.
- S3 "deep" sleep: system does not resume (falls back to s2idle).
Under Windows 11 on the same hardware, Modern Standby lasted
overnight with minimal drain, so the platform can reach S0ix.
Expected: display engine reaches DC6 and package reaches PC10/S0ix
during s2idle.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-42-generic 7.0.0-42.42
ProcVersionSignature: Ubuntu 7.0.0-42.42-generic 7.0.14
Uname: Linux 7.0.0-42-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: fer-vasori 6351 F.... wireplumber
/dev/snd/controlC0: fer-vasori 6351 F.... wireplumber
/dev/snd/seq: fer-vasori 6342 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Nov 2 18:38:05 2026
InstallationDate: Installed on 2026-10-20 (13 days ago)
InstallationMedia: Ubuntu 26.04.1 LTS "Resolute Raccoon" - Release amd64
(20260826)
MachineType: ASUSTeK COMPUTER INC. Vivobook_ASUSLaptop X1504ZA_X1504ZA
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-42-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/20/2025
dmi.bios.release: 5.27
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: X1504ZA.316
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X1504ZA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrX1504ZA.316:bd11/20/2025:br5.27:svnASUSTeKCOMPUTERINC.:pnVivobook_ASUSLaptopX1504ZA_X1504ZA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX1504ZA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaVivobook:
dmi.product.family: Vivobook
dmi.product.name: Vivobook_ASUSLaptop X1504ZA_X1504ZA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2172790
Title:
[ASUS Vivobook 15 X1504ZA] i915 never reaches DC6, package stuck at
PC3, s2idle drains ~4%/h
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