[Bug 67970] New: Kernel bugs related to the powersaving features of mobility radeon x1400

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67970

          Priority: medium
            Bug ID: 67970
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Kernel bugs related to the powersaving features of
                    mobility radeon x1400
          Severity: blocker
    Classification: Unclassified
                OS: Linux (All)
          Reporter: shayanmansuri at yahoo.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

I have a Mobility Radeon X1400 (RV500 Family) on my dell inspiron 6400 (or it's
called inspiron 1501 or 1505 elsewhere). I use Open-source drivers and they
work for me and I have no problem with anything except the powermanagement at
kernel level.

When I want to activate powersaving feature I use these commands:

1. when I use this command:
echo dynpm > /sys/class/drm/card0/device/power_method

nothing happens. I mean GPU frequency remain high. I even do not use a GUI. I'm
in the shell.

2. when I use these commands
echo profile > /sys/class/drm/card0/device/power_method
echo low > /sys/class/drm/card0/device/power_profile

I receive these error: 
 kernel:[  192.253008] NMI: PCI system error (SERR) for reason b1 on CPU 0.
 kernel:[  192.253016] Dazed and confused, but trying to continue

I have noticed that the kernel do not changes the GPU and Vram frequencies
correctly in the profile mode. 

This is what I get when I set it to mid:
# echo mid > /sys/class/drm/card0/device/power_profile
# cat /sys/kernel/debug/dri/0/radeon_pm_info

default engine clock: 432000 kHz
current engine clock: 209250 kHz
default memory clock: 396000 kHz
current memory clock: 135000 kHz
PCIE lanes: 1

This is what I get when I set it to low:
# echo low > /sys/class/drm/card0/device/power_profile
# cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 432000 kHz
current engine clock: 324000 kHz
default memory clock: 396000 kHz
current memory clock: 135000 kHz
PCIE lanes: 1

This is what I get when I set it to high:
# echo high > /sys/class/drm/card0/device/power_profile
# cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 432000 kHz
current engine clock: 432000 kHz
default memory clock: 396000 kHz
current memory clock: 396000 kHz
PCIE lanes: 0

If you look at the above values, it is obvious that the current clock of mid
and low profiles should be replaced with each other.

I've tested this in different distribution of GNU/Linux with different kernel
versions: Including Ubuntu, LMDE, Archlinux and Chakra. with these kernel
versions: 2.6.38, 2.6.39, 3.0.0 RC5, 3.0.0-1-amd64 in LMDE, and lately with
3.4.55 LTS in ubuntu 12.04.2.

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