Comment 45 for bug 1372413

Looking at the logs, it seems there are 3 patterns atm (on mako):

1 - Wifi driver failing to suspend frequently:
Feb 6 12:07:20 ubuntu-phablet kernel: [116497.506926] suspend: enter suspend
Feb 6 12:07:20 ubuntu-phablet kernel: [116497.506956] PM: suspend entry 2015-02-06 17:07:20.782768475 UTC
Feb 6 12:07:20 ubuntu-phablet kernel: [116497.506987] PM: Syncing filesystems...
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.583898] Freezing user space processes ... (elapsed 0.002 seconds) done.
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.605965] sync done.
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.827085] Freezing remaining freezable tasks ... (elapsed 0.003 seconds) done.
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.830564] Suspending console(s) (use no_console_suspend to debug)
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.842742] msm_fb_ext_suspend: Turning off HPD circuitry
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.870301] wlan: [12747:E :HDD] hdd_is_apps_power_collapse_allowed: do not allow APPS power collapse-pmcState = 1 scanRspPending = 0 inMiddleOfRoaming = 0
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.870332] wlan: [12747:E :HDD] wlan_suspend: Fail wlan suspend: not in IMPS/BMPS
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.870332] wlan: [12747:F :HDD] hddDevSuspendHdlr: Not able to suspend wlan
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.870362] dpm_run_callback(): platform_pm_suspend+0x0/0x64 returns -1
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.870362] PM: Device wcnss_wlan.0 failed to suspend: error -1
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.870362] PM: Some devices failed to suspend
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.872041] msm_fb_ext_resume: Turning on HPD circuitry
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.873476] PM: resume of devices complete after 3.051 msecs
Feb 6 12:07:21 ubuntu-phablet wpa_supplicant[6910]: rfkill: WLAN unblocked
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.875459] Restarting tasks ... done.
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.897098] PM: suspend exit 2015-02-06 17:07:21.172813771 UTC
Feb 6 12:07:21 ubuntu-phablet kernel: [116497.897098] suspend: exit suspend, ret = -1 (2015-02-06 17:07:21.172813771 UTC)

2 - Battery -> udev -> Upower heavily consuming the CPU

3 - Device not even trying to suspend anymore after receiving a call