Realtek 8187b Wireless VERY VERY slow

Darren Salt · External Since: Oct 15, 2004 Posts: 359

I demand that Martin Gregorie may or may not have written...

> On Mon, 06 Apr 2009 10:01:37 +0100, chris wrote:
>
> >
> > Yes the screen is a huge power draw. On my Mac laptop dropping the
> > brighten even just a couple of notches makes a huge difference in
> > battery life.
> >
> Here is an indicative number. I have a Fujitsu-Siemans 15" LCD screen on
> a desktop. This draws 12 watts at its usual comfortable brightness. That
> doesn't include the power used by its power brick. I can't imagine that a
> laptop screen would use less power since most of the power is used by the
> backlight.

Depends on the backlight.

Reducing the brightness of my 901's screen to "60%" from "100%" is a 0.2W
saving. Minimum brightness shows a 1W saving. Blanking it shows that the
display consumes approx. 2.6W.

--
| Darren Salt | linux or ds at | nr. Ashington, | Toon
| RISC OS, Linux | youmustbejoking,demon,co,uk | Northumberland | Army
| + Burn less waste. Use less packaging. Waste less. USE FEWER RESOURCES.

Radioactive cats have 18 half-lives.

Folderol · External Since: Dec 13, 2004 Posts: 135

On Mon, 06 Apr 2009 21:35:08 +0100
Darren Salt <news.RemoveThis@youmustbejoking.demon.cu.invalid> wrote:

> I demand that Martin Gregorie may or may not have written...
>
> > On Mon, 06 Apr 2009 10:01:37 +0100, chris wrote:
> >
> > >
> > > Yes the screen is a huge power draw. On my Mac laptop dropping the
> > > brighten even just a couple of notches makes a huge difference in
> > > battery life.
> > >
> > Here is an indicative number. I have a Fujitsu-Siemans 15" LCD screen on
> > a desktop. This draws 12 watts at its usual comfortable brightness. That
> > doesn't include the power used by its power brick. I can't imagine that a
> > laptop screen would use less power since most of the power is used by the
> > backlight.
>
> Depends on the backlight.
>
> Reducing the brightness of my 901's screen to "60%" from "100%" is a 0.2W
> saving. Minimum brightness shows a 1W saving. Blanking it shows that the
> display consumes approx. 2.6W.

Interesting.

I wonder what is taking all the power then.

--
Will J G

chris · External Since: Feb 08, 2005 Posts: 28

Folderol wrote:
> On Mon, 06 Apr 2009 21:35:08 +0100
> Darren Salt <news.RemoveThis@youmustbejoking.demon.cu.invalid> wrote:
>
>> I demand that Martin Gregorie may or may not have written...
>>
>>> On Mon, 06 Apr 2009 10:01:37 +0100, chris wrote:
>>>
>>>> Yes the screen is a huge power draw. On my Mac laptop dropping the
>>>> brighten even just a couple of notches makes a huge difference in
>>>> battery life.
>>>>
>>> Here is an indicative number. I have a Fujitsu-Siemans 15" LCD screen on
>>> a desktop. This draws 12 watts at its usual comfortable brightness. That
>>> doesn't include the power used by its power brick. I can't imagine that a
>>> laptop screen would use less power since most of the power is used by the
>>> backlight.
>> Depends on the backlight.
>>
>> Reducing the brightness of my 901's screen to "60%" from "100%" is a 0.2W
>> saving. Minimum brightness shows a 1W saving. Blanking it shows that the
>> display consumes approx. 2.6W.
>
> Interesting.
>
> I wonder what is taking all the power then.

Don't forget that you're not comparing equivalent products. One's a
recent laptop screen made with energy concerns in mind and (assuming
from it's size) a relatively old desktop screen which has no energy
concerns. Plus, there's a huge size difference 9" vs 15". My
trigonometry is very rusty now, but I'd guess that the area of the 9" is
probably ~1/3 that of the 15".

Martin Gregorie · External Since: Jan 23, 2009 Posts: 14

On Tue, 07 Apr 2009 09:29:08 +0100, chris wrote:

>
> Don't forget that you're not comparing equivalent products. One's a
> recent laptop screen made with energy concerns in mind and (assuming
> from it's size) a relatively old desktop screen which has no energy
> concerns. Plus, there's a huge size difference 9" vs 15". My
> trigonometry is very rusty now, but I'd guess that the area of the 9" is
> probably ~1/3 that of the 15".

Exactly so.

I forgot to say that I didn't play with brightness settings on the
screen, just noticed that the somewhat elderly desktop rig (866 MHz P3
IBM NetVista) plus the flat screen draws 62 watts which dropped to 50
watts when I hit the off switch on the screen.

By comparison, the laptop I'm writing this on (Lenovo R61i) draws up to
30 watts depending on how busy it is, including the 1.8 watts used by its
power brick.

--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

Gordon · External Since: Mar 28, 2009 Posts: 15

Moog wrote:
> On Fri, 03 Apr 2009 23:22:08 +0100
> Gordon <gordonbparker.RemoveThis@yahoo.com> wrote:
>
>> Moog wrote:
>>> On Fri, 03 Apr 2009 23:06:04 +0100
>>> Gordon <gordonbparker.RemoveThis@yahoo.com> wrote:
>>>
>>>> Moog wrote:
>>>>> On Fri, 03 Apr 2009 22:55:13 +0100
>>>>> Gordon <gordonbparker.RemoveThis@yahoo.com> wrote:
>>>>>
>>>>> <snip>
>>>>>> Hmmm. I paid £220 in total for my Tosh Netbook - 80GB HDD, 2GB
>>>>>> RAM......battery life about 3 hours - as much as I need.....
>>>>> Touche. However.....
>>>>>
>>>>> Can you take your /home partition with you in your wallet?
>>>>> Wink

>>>>>
>>>> Yes - if I copy it to my 8GB USB stick.. Smile

>>> I haven't got room for one of those, due to the accumulation of bank
>>> notes. Wink

>>>
>>> All joking aside though, Most netbooks have an "Atom". There are
>>> differences in HD and RAM, but these have their own pros and cons.
>>>
>>> My decision was solely base on the keyboard. I'm obviously too old
>>> school and dare I say it, fat fingered.
>>>
>> So am I - unfortunately, I bought an Acer Aspire which has a slightly
>> larger keyboard than the Tosh - it took me SIX hours not to connect to
>> my WiFi - and then the wireless light went out and wouldn't come back
>> on. I have always had Tosh laptops, and had no problems with them, so
>> I took the Acer back and swapped it for a Tosh which connected to the
>> WiFi straight out of the box....interestingly I have an Acer PC I
>> bought through my company which has never had any problems....
>
> There *was* an issue with the acer_wmi module setting the
> rfkillswitch to zero. This has been solved in Ubuntu 9.04 Beta
> (apparently). The LED lights spring into life with the simple
> installation of the backport modules from the repository.
>

NOW I find out! Sad

--
Registered Linux User no 240308
gordonATgbpcomputingDOTcoDOTuk
to email me remove the obvious!

Moog · External Since: Feb 02, 2007 Posts: 181

Gordon illuminated uk.comp.os.linux by typing:

<snip>
>> There *was* an issue with the acer_wmi module setting the
>> rfkillswitch to zero. This has been solved in Ubuntu 9.04 Beta
>> (apparently). The LED lights spring into life with the simple
>> installation of the backport modules from the repository.
>>
>
> NOW I find out! Sad

Heh. Sorry Gordon.

--
Moog

"Some mornings it just doesn't seem worth it to gnaw through the
leather straps."

Gordon · External Since: Sep 25, 2006 Posts: 35

Moog wrote:
> Gordon illuminated uk.comp.os.linux by typing:
>
> <snip>
>>> There *was* an issue with the acer_wmi module setting the
>>> rfkillswitch to zero. This has been solved in Ubuntu 9.04 Beta
>>> (apparently). The LED lights spring into life with the simple
>>> installation of the backport modules from the repository.
>>>
>> NOW I find out! Sad

>
> Heh. Sorry Gordon.
>

That's OK - I love my tosh.....

--
Registered Linux User no 240308
gordonATgbpcomputingDOTcoDOTuk
to email me remove the obvious!