Arch Linux

Drehstromlampe

Member

From: GER

Registered: 2015-07-18

Posts: 51

Power saving on Intel Broadwell-U

Hi,

I'm running Arch on a notebook with an Intel Broadwell-U processor + graphics.
When i unplug the AC-adapter the notebook switches to power-saving mode. (On AC performance is fine)
This has a huge impact on graphics performance when gaming.

So i want to disable power saving for the graphics card.

What I found out so far:
Powertop suggests this optimization for power-saving

echo 'auto' > '/sys/bus/pci/devices/0000:00:02.0/power/control'; 

I guess this is the same as

echo 'auto' > '/sys/class/drm/card0/power/control';

The only two parameters i can write to this "file" are 'on' and 'auto', which do have the same effect. power saving for the graphics card stays active and performance stays crappy.
I tried writing 'performance', 'max_power' and 'off' to this file. All of them are being rejected as "invalid argument"

So is this the wrong way to do this? Or am i missing a parameter?
Google didn't help so far.

Also, I have weird graphic errors in this textbox. Colors get inverted when a make a new line. As soon as i scroll, everything's back to normal.

Head_on_a_Stick

Member

From: The Wirral

Registered: 2014-02-20

Posts: 9,003

Website

Re: Power saving on Intel Broadwell-U

i want to disable power saving

https://wiki.archlinux.org/index.php/In … ng_Options

I have weird graphic errors

https://wiki.archlinux.org/index.php/In … SNA_issues

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Jin, Jîyan, Azadî

Drehstromlampe

Member

From: GER

Registered: 2015-07-18

Posts: 51

Re: Power saving on Intel Broadwell-U

Thanks for the quick reply.
I stumbled upon the archwiki-thread.

However, this seems like a more static aproach. Idon't want to disable power saving on the graphics chip alltogether but just when i need it (when gaming).
I'm OK with changing this manually (calling a script as root if necessary).
Just like with the open-source radeon drivers where you can write the power-method to a file in the /sys filesystem.

Last edited by Drehstromlampe (2015-07-18 21:17:42)