[ltp] ACPI S3 power drain and Thinkpad Wiki/radeonfb

[Tino Keitel]

On Fri, Jul 15, 2005 at 17:56:55 +0100, honey@gneek.com wrote:
> Hi,
> 
> I'm trying to reduce the well-known ACPI S3 power drain problem on my
> T40, and following the advice on the Thinkpad Wiki at:
> 
> http://www.thinkwiki.org/wiki/Problem_with_high_power_drain_in_ACPI_sleep
> 
> Firstly, I confirmed my model (T40 237392G) is affected by
> downloading the sleep.sh script and running for 20 minutes on
> battery.  Result:
> Thu Jul 14 23:16:04 BST 2005
> before: 16030 mWh
> after: 14620 mWh
> diff: -1410 mWh
> seconds: 1356 sec
> result: -3743 mW
> Your model seems to be affected.
> 
> I'm using Fedora Core 4, and as stated on the site, confirmed that a
> patch is included to fix this - it's called
> linux-2.6.11-radeon-backlight.patch and having read through, I
> confirmed my module isn't whitelisted.  No problem: I loaded the
> radeonfb module (which isn't normally loaded) with:

AFAIK the power drain has nothing to do with the backlight, but with
some power saving state of the radeon chip which was not entered.

Regards,
Tino