[Bug 54791] New: high power usage with HD4200 (RS880)

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Sep 11 14:02:17 PDT 2012


             Bug #: 54791
           Summary: high power usage with HD4200 (RS880)
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: suse at kabelfunk.de
         QAContact: xorg-team at lists.x.org

Created attachment 67000
  --> https://bugs.freedesktop.org/attachment.cgi?id=67000
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.

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