[Bug 95044] New: [NVA0] [Reclocking] GPU doesn't relax memory clocks - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 95044] New: [NVA0] [Reclocking] GPU doesn't relax memory clocks
Date: Wed, 20 Apr 2016 21:41:00 +0000	[thread overview]
Message-ID: <bug-95044-8800@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=95044

            Bug ID: 95044
           Summary: [NVA0] [Reclocking] GPU doesn't relax memory clocks
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: debianlinuxero1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 123101
  --> https://bugs.freedesktop.org/attachment.cgi?id=123101&action=edit
Kernel_log

The card doesn't relax memory clocks on step down reclock transitions.

For example, if I try [code]echo 07 > pstate[/code] from a 0f state, I see this
:

[code]
03: core 300 MHz shader 600 MHz memory 100 MHz
07: core 400 MHz shader 800 MHz memory 300 MHz AC DC *
0f: core 576 MHz shader 1242 MHz memory 999 MHz
AC: core 399 MHz shader 799 MHz memory 999 MHz
[/code]

The problem happens in the 3 step down possible transitions :

0f -> 07, 07 -> 03 and 0f -> 03.

The memory clock always stands as high as the major's state I set up.

The system is :

Phenom II X4 905e, 4 GB DDR3 @ 1333, nVidia GeForce GTX 260, 790FX chipset.

Debian GNU/Linux stretch (Testing) x64

Kernel 4.4.0-1, libdrm-nouveau2 2.4.67-1.

The attachment file shows a kernel dmesg after switching from state 0f to 07.

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