Low Mhash/s when screen shuts down

[Gogluism]

I have noticed a major decrease in hashing speed when I close my laptop lid, it goes down from 48M (Yes, I know it's low) to about 20M.
My power plan is always on high performance: hdd always on, no sleep/hibernate/anything else. Actually I always remove my battery when my laptop is on full throttle.
This only happens when my screen goes black, even when I close it for 3 seconds, I don't want to let it on for hours.
I use CGminer and GUIminer, same results.
AMD A8-4500M with Radeon HD 7640G, Win7/64, last drivers, everything is in order.
Any help is appretiated, thanks.

http://gpuz.techpowerup.com/13/04/22/4gp.png

[vm1990]

try disabling the screen saver so that its set to none if that dosnt work then sticking the laptop on locked should help

[Gogluism]

Yeah I forgot to mention that my screensaver is also disabled 

[Kruncha]

Yeah I forgot to mention that my screensaver is also disabled 

how about all the other power saving options, are they all off?

K.

[Gogluism]

Yeah I forgot to mention that my screensaver is also disabled 

how about all the other power saving options, are they all off?

K.

Yup, high performance only.

[Fiyasko]

go into the registry and disable all entrys of "EnableULPS"
"ultra low power state" Try that.

[alecpap]

Did you disable all of the settings that lower power use when the lid is closed?

[Fiyasko]

ohhh, MYyyy GOODDD ITS A LAPTOP, NO!, STAHP!
Seriously you should Never mine bitcoins on a Laptop!, Ohmygosh you are GOING to burn out the thing within a year or less, Its not worth a broken computer!
NEVER MINE COINS ON A LAPTOP, THERE ARE SO MANY REASONS WHY THAT I DONT HAVE TIME TO LIST THEM ALL

[lbr]

ohhh, MYyyy GOODDD ITS A LAPTOP, NO!, STAHP!
Seriously you should Never mine bitcoins on a Laptop!, Ohmygosh you are GOING to burn out the thing within a year or less, Its not worth a broken computer!
NEVER MINE COINS ON A LAPTOP, THERE ARE SO MANY REASONS WHY THAT I DONT HAVE TIME TO LIST THEM ALL

I'm mining on my laptop for about a month 24/7, 100% uptime, everything is ok ;p
I've also used laptops as SQL/DNS/Web servers and for gaming.
However, ofc, you are right in a sense that one should know the basics of laptop limitations(cooling+power draw mostly) before running something 'heavy'.

[lbr]

I have noticed a major decrease in hashing speed when I close my laptop lid, it goes down from 48M (Yes, I know it's low) to about 20M.
My power plan is always on high performance: hdd always on, no sleep/hibernate/anything else. Actually I always remove my battery when my laptop is on full throttle.
This only happens when my screen goes black, even when I close it for 3 seconds, I don't want to let it on for hours.
I use CGminer and GUIminer, same results.
AMD A8-4500M with Radeon HD 7640G, Win7/64, last drivers, everything is in order.
Any help is appretiated, thanks.

Probably GPU is entering low power state.
To find out if it does, launch GPU-Z and enable logging, after a while once the screen turns off check log for GPU frequencies and voltage, they should stay the same. If they are not the same - GPU enters power saving.
Not sure about integrated graphics, but discrete AMD GPU power saving can be disabled in Catalyst.
Also maybe CPU is entering extremely low power state, try checking with CPU-Z or ThrottleStop.
And since it is AMD APU, maybe it drops memory frequencies..
So.. you need to log all the frequncies and voltages

btw, why do you remove battery? It makes no sense, except the heat maybe. And some laptops(Dell) think that they do not have enough power available when there is not battery and slow everything down.

[Nomdeplume]

ohhh, MYyyy GOODDD ITS A LAPTOP, NO!, STAHP!
Seriously you should Never mine bitcoins on a Laptop!, Ohmygosh you are GOING to burn out the thing within a year or less, Its not worth a broken computer!
NEVER MINE COINS ON A LAPTOP, THERE ARE SO MANY REASONS WHY THAT I DONT HAVE TIME TO LIST THEM ALL

I run cgminer on my work laptop when it is connected to work power. It has a pretty nice Nvidia Quadro chipset and generates a measly 12MH but it is an HP workstation laptop. If it burns out (oops), HP is really good about replacing parts overnight, and I still have 4 other HP workstation computers I can use each also mining with cool running Firepro workstation cards along with my 7990's at home.

[namdrazil]

try disabling both sleeping and the screen sleeping in power options

[Drizzle]

btw, why do you remove battery? It makes no sense, except the heat maybe. And some laptops(Dell) think that they do not have enough power available when there is not battery and slow everything down.

Probably to save the battery for when it's needed. Having it hooked to power all the time reduces its life, since there's still some discharge/recharge going on.

[lbr]

btw, why do you remove battery? It makes no sense, except the heat maybe. And some laptops(Dell) think that they do not have enough power available when there is not battery and slow everything down.

Probably to save the battery for when it's needed. Having it hooked to power all the time reduces its life, since there's still some discharge/recharge going on.

That's a myth.

[Fiyasko]

-snip-

Probably to save the battery for when it's needed. Having it hooked to power all the time reduces its life, since there's still some discharge/recharge going on.

That's a myth.

No its not, doing this damages batteries, sure you can keep going 99%-100%-99%-100% but its Going to hurt your batteries lifespan.
You're probobly thinking about how a car battery works, They sit at nearly 60% charge average, wich is much differant than 100%

Goahead, charge a fully charged battery, tap a bit of current out of it, Fully charge it again- Repeat, That battery will die faster than the battery that goes from 1% back upto 100%
0%-100% can also hurt a battery

[blobzorz]

There may be a power-saving feature enabled in BIOS