[Bug 67321] New: [dpm] rs880: Power usage doesn't drop with dpm=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67321

          Priority: medium
            Bug ID: 67321
          Assignee: xorg-driver-ati at lists.x.org
           Summary: [dpm] rs880: Power usage doesn't drop with dpm=1
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: suse at kabelfunk.de
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

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

It consume with fglrx ~16W. (kernel 3.4.47)
With radeon (kernel 3.11-rc2) and power_profile=low ~20W
With radeon.dpm=1 (kernel 3.11-rc2) ~20W

linux-7goe:/home/dom # echo battery
>/sys/class/drm/card0/device/power_dpm_state
linux-7goe:/home/dom # echo low>
/sys/class/drm/card0/device/power_dpm_force_performance_level 
linux-7goe:/home/dom # modprobe ec_sys
linux-7goe:/home/dom # cat /sys/kernel/debug/dri/64/radeon_pm_info 
uvd    vclk: 0 dclk: 0
power level 0    sclk: 20000 vddc_index: 1

The fglrx still uses ~4W less than radeon.dpm=1

It would be great when radeon.dpm=1 uses as less power as the fglrx driver.

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