[Bug 43114] New: Can't set high engine clock for RadeonHD 6620G

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Mon Apr 16 17:02:48 PDT 2012


           Summary: Can't set high engine clock for RadeonHD 6620G
           Product: Drivers
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: runetmember at gmail.com
        Regression: No

APU model: A8-3500M with Radeon HD 6620G.
Laptop model: Acer Aspire 7560G.
According to official specs of this APU
GPU core clock on high profile should be 444 MHz, but even when I set high
profile manually

~# cat /sys/class/drm/card0/device/power_method
~# cat /sys/class/drm/card0/device/power_profile

GPU core clock is not 444 MHz anyway, even below 200 MHz:
~$ cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 200000 kHz
current engine clock: 7990 kHz
default memory clock: 667000 kHz
Maybe output of radeon_pm_info is incorrect, because change between different
profiles and dynpm make no difference in radeon_pm_info information.

Reproduceable with Linux 3.2 and Linux 3.4rc3. dmesg of 3.4rc3 boot process
attached. Is there any additional information I need to provide?

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