Faster battery discharge when resumed from hibernate. SOLVED

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Faster battery discharge when resumed from hibernate. SOLVED

Postby gpgdx on Thu Mar 14, 2013 3:10 pm

Hello all,

I am running LMDE with liquorix 3.7.0-10.dmz.2 (686) kernel on Acer Aspire 3820TG.

After some configuration with the help of google (a lot of which was retrieved from this forum) I generally have a great battery life. When my machine starts normally (i.e. after a previous shut down or a reboot), my battery is reporting a discharge at the rate of about 10W. But when I resume from a hibernate the battery discharges at about 26W-27W (so, the battery drains faster). Also, the machine gets heated up more after I resume from a hibernate as opposed to a normal operation after normal start-up. I don't know what diagnostic information to provide to help locate the problem. So, to keep it simple, I leave it here**. I would grateful if anyone can provide hints as to what might be the issue. I can provide more information if you suggest me what details would help.

Best regards,
Gopal

**p.s. Some details of my configs just in case:
1. Graphic card: ATI mobility radeon HD5650 (hybrid graphics)
2. GRUB_CMDLINE_LINUX="quiet splash acpi_osi=Linux pcie_aspm=force acpi_backlight=vendor radeon.audio=1 resume=/dev/sda1"
3. # cat /etc/modprobe.d/radeon-kms.conf
options radeon modeset=1
4. # cat /etc/modprobe.d/i915-kms.conf
options i915 modeset=1 i915_enable_rc6=1 i915_enable_fbc=1 lvds_downclock=1 semaphores=1
5. I use a stripped down version of hardran3's powersave script (http://crunchbang.org/forums/viewtopic.php?id=11954)
Last edited by gpgdx on Thu Mar 28, 2013 5:09 am, edited 1 time in total.
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Re: Battery discharges faster (~26W) when resumed from hiber

Postby DrHu on Thu Mar 14, 2013 3:22 pm

OK, about the script, but I would also check general information ref: power management
http://projects.gnome.org/gnome-power-manager/
https://wiki.ubuntu.com/UbuntuBugDay/20101118
--as well as any bugs/issues

https://bugs.launchpad.net/ubuntu/+sour ... bug/500997
--I am thinking something like this may a fault, so script checkup
    I would basically tease out that whole script you reference and see if you can spot any likely points of contention (parameters being selected, for example )..
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Faster battery discharge when resumed from hibernate. SOLVED

Postby gpgdx on Fri Mar 15, 2013 2:04 pm

Thanks for the reply. Now it will take some time for me to digest the suggestions, gather information and perform tests. I noticed one thing in pm-utils power.d scripts. It seems that the scripts under /usr/lib/pm-utils/power.d (e.g. laptop-mode, sata-alpm, pcie_aspm etc. that came installed by default with pm-utils) don't have any effect even though they have execute permission. They work when I copy them to /etc/pm/power.d. Is this the expected behaviour? Well, I am sorry if this is a digression.

Best regards,
Gopal
Last edited by gpgdx on Thu Mar 28, 2013 5:10 am, edited 1 time in total.
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Faster battery discharge when resumed from hibernate. SOLVED

Postby gpgdx on Fri Mar 15, 2013 2:17 pm

One more thing I forgot to mention in my first post is: powertop shows everything (except wireless powersaving for interface wlan0) as "Good" in both cases (i.e. after normal start-up as well as after resuming from hibernate). Would it perhaps mean that the problem is somewhere outside the pm scripts?

Best regards,
Gopal
Last edited by gpgdx on Thu Mar 28, 2013 5:10 am, edited 1 time in total.
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Faster battery discharge when resumed from hibernate. SOLVED

Postby gpgdx on Sat Mar 23, 2013 4:31 am

I have so far found only one difference between resume from hibernate and from shutdown. It is that powertop says "Autosuspend for USB device Acer Module [Broadcom Corp]" is Bad when resumed from hibernate as opposed to Good otherwise (both on battery and AC). Any ideas on how to fix this? Thanks in advance.
Last edited by gpgdx on Thu Mar 28, 2013 5:10 am, edited 1 time in total.
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Faster battery discharge when resumed from hibernate. SOLVED

Postby gpgdx on Wed Mar 27, 2013 4:52 pm

I found the fix at URL, https://bugzilla.redhat.com/show_bug.cgi?id=873027. This fix can be automated using the script provided in the point 5 of this blog (http://blog.lazut.in/2012/06/vgaswitche ... uered.html). After applying it, now the battery discharge rate on my laptop is around 10-12W both after resuming from the hibernate as well as shutdown.

P.S. After discovering this fix, I am afraid if the diagnostic information I focused on previously was misdirecting.
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