Bug 54791

Summary: high power usage with HD4200 (RS880)
Product: xorg Reporter: Dominik Kopp <suse>
Component: Driver/RadeonAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED MOVED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
the vbios rom none

Description Dominik Kopp 2012-09-11 21:02:17 UTC 
Created attachment 67000 [details]
the vbios rom

My laptop (Lenovo Edge 11) has the Mobility Radeon HD 4200 Series chip (RS880M) 
(windows says it's a HD 4225)

With radeon driver the laptop consumes 20W

Changing the power_profile saves 1W (now 19W):
echo low > /sys/class/drm/card0/device/power_profile

cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 380000 kHz
current engine clock: 200000 kHz
default memory clock: 400000 kHz

However, using the fglrx driver it consumes only 16W.
=> 3-4W less.

The radeon driver should be as energy efficiently as the fglrx.
Comment 1 Martin Peres 2019-11-19 07:36:11 UTC 
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