[Bug 112315] New: 5.3.11 regression: No RC6 on Kaby Lake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112315

            Bug ID: 112315
           Summary: 5.3.11 regression: No RC6 on Kaby Lake
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Keywords: bisected, regression
          Severity: not set
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tomi at nomi.cz
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: imre.deak at intel.com,
                    intel-gfx-bugs at lists.freedesktop.org
     i915 platform: KBL

"drm/i915/gen8+: Add RC6 CTX corruption WA"
(d4360736a7c0a6326e3bbdf7d41181f6ed03d9a6) in 5.3 stable broke RC6 on my Kaby
Lake ThinkPad 25 (T470 equiv). This prevents the CPU package from entering
package C-states. Happens every time, no suspend/resume needed. The commit
message suggests suspend/resume may actually help, but that's not the case here
either. No mention of "RC6 context corrupted" in dmesg, but perhaps I need to
set drm.debug?

Reverting the commit fixes the issue.

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