Battery preferences in both the scenarios are same.
Conky is running in both sessions.
With the age of the laptop, now the gap between battery backup available
in normal user session and root user session has increased and is some
where around 15-20 minutes. Thus normal user still continues to provide
more backup.
Hope following information helps:
Output of 'powertop' from 'root' user
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 6.8%) 2.00 Ghz 1.8%
polling 0.0ms ( 0.0%) 1.60 Ghz 0.0%
C1 0.0ms ( 0.0%) 1200 Mhz 0.0%
C2 0.8ms ( 0.4%) 800 Mhz 98.2%
C4 4.1ms (92.7%)
Wakeups-from-idle per second : 231.4 interval: 5.0s
Power usage (ACPI estimate): 26.0W (0.9 hours)
Top causes for wakeups:
29.5% ( 95.0) <interrupt> : ohci1394, i...@pci:0000:00:02.0
18.5% ( 59.6) firefox : schedule_timeout (process_timeout)
7.5% ( 24.2) USB device 6-1 : USB OPTICAL MOUSE ()
7.5% ( 24.0) <interrupt> : uhci_hcd:usb3, uhci_hcd:usb6, HDA Intel
6.5% ( 20.8) webAccess : futex_wait (hrtimer_wakeup)
6.2% ( 19.8) <kernel IPI> : Rescheduling interrupts
Suggestion: Enable SATA ALPM link power management via:
echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
or press the S key.
Q - Quit R - Refresh S - SATA Link Power Management
Output of 'top' from 'root' user:
16663 root 20 0 10184 2736 2036 S 3 0.1 0:08.40 conky
17157 root 20 0 298m 154m 24m S 2 5.1 0:17.13 firefox
16345 root 20 0 409m 30m 8560 S 1 1.0 0:20.70 Xorg
16603 root 20 0 44380 20m 13m S 1 0.7 0:02.50 gnome-panel
1 root 20 0 3056 1884 564 S 0 0.1 0:01.46 init
2 root 15 -5 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0 0.0 0:00.06 migration/0
4 root 15 -5 0 0 0 S 0 0.0 0:00.58 ksoftirqd/0
5 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/0
6 root RT -5 0 0 0 S 0 0.0 0:00.06 migration/1
7 root 15 -5 0 0 0 S 0 0.0 0:01.96 ksoftirqd/1
8 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/1
9 root 15 -5 0 0 0 S 0 0.0 0:00.12 events/0
10 root 15 -5 0 0 0 S 0 0.0 0:00.10 events/1
11 root 15 -5 0 0 0 S 0 0.0 0:00.00 khelper
51 root 15 -5 0 0 0 S 0 0.0 0:00.00 kintegrityd/0
52 root 15 -5 0 0 0 S 0 0.0 0:00.00 kintegrityd/1
Output of 'powertop' from normal user:
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 3.3%) 2.00 Ghz 0.0%
polling 0.0ms ( 0.0%) 1.60 Ghz 0.0%
C1 0.0ms ( 0.0%) 1200 Mhz 0.0%
C2 1.7ms ( 0.3%) 800 Mhz 100.0%
C4 7.3ms (96.4%)
Wakeups-from-idle per second : 134.6 interval: 5.0s
Power usage (ACPI estimate): 19.7W (1.1 hours)
Top causes for wakeups:
47.7% ( 83.8) <interrupt> : ohci1394, i...@pci:0000:00:02.0
12.0% ( 21.0) webAccess : futex_wait (hrtimer_wakeup)
5.7% ( 10.0) <kernel core> : scan_async (ehci_watchdog)
5.5% ( 9.6) notification-da : schedule_timeout (process_timeout)
4.9% ( 8.6) <kernel IPI> : Rescheduling interrupts
4.6% ( 8.0) <kernel module> : usb_hcd_poll_rh_status (rh_timer_func)
Suggestion: Enable SATA ALPM link power management via:
echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
or press the S key.
Output of 'top' from normal user:
18294 parag 20 0 10184 2692 2004 S 1 0.1 0:03.20 conky
17978 root 20 0 405m 27m 8744 S 1 0.9 0:12.06 Xorg
1 root 20 0 3056 1884 564 S 0 0.1 0:01.48 init
2 root 15 -5 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0 0.0 0:00.06 migration/0
4 root 15 -5 0 0 0 S 0 0.0 0:00.60 ksoftirqd/0
5 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/0
6 root RT -5 0 0 0 S 0 0.0 0:00.06 migration/1
7 root 15 -5 0 0 0 S 0 0.0 0:02.02 ksoftirqd/1
8 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/1
9 root 15 -5 0 0 0 S 0 0.0 0:00.14 events/0
10 root 15 -5 0 0 0 S 0 0.0 0:00.12 events/1
11 root 15 -5 0 0 0 S 0 0.0 0:00.00 khelper
51 root 15 -5 0 0 0 S 0 0.0 0:00.00 kintegrityd/0
52 root 15 -5 0 0 0 S 0 0.0 0:00.00 kintegrityd/1
54 root 15 -5 0 0 0 S 0 0.0 0:00.02 kblockd/0
55 root 15 -5 0 0 0 S 0 0.0 0:00.02 kblockd/1
--
"root" user consuming more power.
https://bugs.launchpad.net/bugs/314813
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