[Bug 62493] New: Clock speed incorrect with Radeon driver on Radeon HD7340 from an E2-1800 CPU

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Mar 18 13:21:51 PDT 2013


          Priority: medium
            Bug ID: 62493
          Assignee: xorg-driver-ati at lists.x.org
           Summary: Clock speed incorrect with Radeon driver on Radeon
                    HD7340 from an E2-1800 CPU
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: philippe.l at live.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/Radeon
           Product: xorg

My laptop is equipped with an AMD E2-1800 processor which comes paired with a
radeon HD7340 video processor. It appears that the driver incorrectly sets the
clock speed for this model. For example:

[root at localhost ~]# cat /sys/kernel/debug/dri/0/radeon_pm_info 
default engine clock: 200000 kHz
current engine clock: 5730 kHz
default memory clock: 667000 kHz

I believe this GPU is capable of running at 523-680Mhz with the latter number
being turbo mode. However, the maximum engine clock appears to be stuck at
200MHz and the current clock is only 5Mhz. The current clock appears to change,
but I've never seen go higher than 70Mhz. With the clock being so low, this
makes for a sluggish experience when using a composited desktop like Gnome 3. I
have tried changing the power management state to use the dynamic setting, but
this has had no impact on the clock speeds posted.

[root at localhost ~]# cat /sys/class/drm/card0/device/power_method 

I'm currently using the latest stable radeon driver (version 7.1) on Mageia
Linux with kernel 3.8. Is this a configuration problem, or a problem with the

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