Ubuntu
linux-source-2.6.17 package

Excessive battery usage in ACPI sleep

Bug #65856 reported by Marius Gedminas
4
Affects Status Importance Assigned to Milestone
linux-source-2.6.17 (Ubuntu)
Won't Fix
Undecided
Unassigned
linux-source-2.6.20 (Ubuntu)
Fix Released
Undecided
Unassigned

Bug Description

Binary package hint: linux-image-2.6.17-10-generic

After I've upgraded to Edgy lately I started noticing that my Thinkpad T42 uses up about 90% of the battery while sleeping. Dapper used to use about 10% overnight.

The files in /proc/acpi/battery indicate that my battery still has 88% of design capacity. 90% of that during 15 hours of sleep is about 2500 mW. Could bug 8711 or something like it be back?

Revision history for this message
Marius Gedminas (mgedmin) wrote :

Before the upgrade my /var/log/kern.log used to contain these messages:

  radeonfb (0000:01:00.0): suspending to state: 2...
  radeonfb (0000:01:00.0): switching to D2 state...

now I only get

  radeonfb (0000:01:00.0): suspending to state: 2...

I suppose I should try to modprobe radeonfb force_sleep=1 next. Maybe my laptop (Thinkpad T42 2373-FWG) is not mentioned in the whitelist?

http://thinkwiki.org/wiki/Problem_with_high_power_drain_in_ACPI_sleep asks for the output of lspci -d "1002:*" -vn, here is mine:

01:00.0 0300: 1002:4c57
        Subsystem: 1014:0530
        Flags: bus master, stepping, fast Back2Back, 66MHz, medium devsel, latency 66, IRQ 11
        Memory at e0000000 (32-bit, prefetchable) [size=128M]
        I/O ports at 3000 [size=256]
        Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at c0120000 [disabled] [size=128K]
        Capabilities: <access denied>

Revision history for this message
Marius Gedminas (mgedmin) wrote :

I edited /etc/modules and changed the radeonfb line to read

    radeonfb force_sleep=1

I rebooted, suspended, resumed and checked dmesg -- nothing about going to D2 sleep.

I then rebooted and added video=radeonfb:force_sleep=1 to the kernel command line, suspended, resumed and checked dmesg. Nothing about going to D2 sleep.

Revision history for this message
Marius Gedminas (mgedmin) wrote :

The bug appears to be fixed in Feisty (kernel 2.6.20-15-generic). A 16-hour ACPI sleep consumes only 20% of battery. dmesg mentions "radeonfb: forcefully enabling D2 sleep mode" on boot and then "radeonfb (0000:01:00.0): switching to D2 state..." on suspend.

Revision history for this message
Brian Murray (brian-murray) wrote :

The 18 month support period for Edgy Eft 6.10 has reached it's end of life. As a result, we are closing the linux-source-2.6.17 Edgy Eft kernel task.

Changed in linux-source-2.6.17:
status: New → Won't Fix
Revision history for this message
Brian Murray (brian-murray) wrote :

I am marking this bug as Fix Released against the Feisty kernel based off comment 3.

Changed in linux-source-2.6.20:
status: New → Fix Released
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