[Bug 94061] New: [radeon - Kaveri] dpm works badly - much to high power consumption compared to catalyst

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=94061

            Bug ID: 94061
           Summary: [radeon - Kaveri] dpm works badly - much to high power
                    consumption compared to catalyst
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.14.x ... 3.19.
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: abcdmail at freenet.de
        Regression: No

With all kernel versions >= 3.14 (I didn't test versions below), radeon / dpm
consumes about 6 W more compared to catalyst in idle mode (X-server 1.15 /
1.16) with Kaveri graphics (AMD A10-7800 Radeon R7).

Idle mode: Xorg runs (KDE 4.11.x), screen saver off, static screen, load: 0.0

If the screen is turned off by X, the power consumption finally reaches the
same level as with catalyst. It's raising immediately again at the moment the
screen is switched on again by X.

Seams the lowest rate is never reached as long as even a static screen has to
be drawn - but it should!

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