[Bug 98979] New: [i915][HSW][PM] Unable to use GFX RC6 on Dell Precision M6800

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98979

            Bug ID: 98979
           Summary: [i915][HSW][PM] Unable to use GFX RC6 on Dell
                    Precision M6800
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: shawn.starr at rogers.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Using the following kernel options:

BOOT_IMAGE=/boot/vmlinuz-4.9.0-rc7+
root=UUID=f834b05c-55f3-407b-9a63-fc6b04d4c845 ro rhgb slub_debug=-
cgroup_disable=memory console=tty0 console=ttyUSB0,9600n8 nmi_watchdog=0
audit=0 amdgpu.gartsize=8192 amdgpu.vm_size=16 amdgpu.powerplay=1
amdgpu.exp_hw_support=1 rd.driver.blacklist=radeon [video=eDP-1:d
video=VGA-1:e] resume=/dev/sda7 intel_iommu=igfx_off

the driver will not turn on RC6 GFX power saving state(s).

I've attached kernel dmesg with driver debug output.


Tests done:

1) Run w/o any video= options, same result
2) Disable Intel AMT completely, same result
3) Force RC6, does not enable in driver.

Kernel: Dec 1st build, Linux 4.9-rc7 + drm-next-4.10-wip merged in for AMDGPU
(hybrid graphics use).

Powertop / turbostat -d show no GFX stats reported.

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