[Bug 111047] New: On IceLake machine GPU can't enter DC6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111047

            Bug ID: 111047
           Summary: On IceLake machine GPU can't enter DC6
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: acelan at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 144690
  --> https://bugs.freedesktop.org/attachment.cgi?id=144690&action=edit
kern.log with drm.debug=0x1e

We're working on IceLake platforms, but GPU can't enter DC6.
The DC5 count is increasing while the screen dim.

$ sudo cat /sys/kernel/debug/dri/0/i915_dmc_info
fw loaded: yes
path: i915/icl_dmc_ver1_07.bin
version: 1.7
DC3 -> DC5 count: 30
DC5 -> DC6 count: 0
program base: 0x0b004040
ssp base: 0x00006fc0
htp: 0x00a40088

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