[Bug 104041] New: 4.2 kernel: many *ERROR* mismatch in has_drrs

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=104041

            Bug ID: 104041
           Summary: 4.2 kernel: many *ERROR* mismatch in has_drrs
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tiwai at suse.de
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 186721
  --> https://bugzilla.kernel.org/attachment.cgi?id=186721&action=edit
dmesg output

This originates from another bug 104001.

4.2 kernel spews many kernel warnings on HP EliteBook 940 G1 laptop with
Haswell chip.

At booting:

[    5.205358] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in
has_drrs (expected 1, found 0)
[    5.205361] ------------[ cut here ]------------
[    5.205387] WARNING: CPU: 3 PID: 76 at
drivers/gpu/drm/i915/intel_display.c:12691
intel_modeset_check_state+0x5a4/0x870 [i915]()
[    5.205388] pipe state doesn't match!

At plugging DP on dock (MST):

[   33.096865] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in
has_drrs (expected 1, found 0)
[   33.096876] ------------[ cut here ]------------
[   33.096916] WARNING: CPU: 3 PID: 988 at
drivers/gpu/drm/i915/intel_display.c:12691
intel_modeset_check_state+0x5a4/0x870 [i915]()
[   33.096919] pipe state doesn't match!
....
[   33.230467] WARNING: CPU: 3 PID: 988 at
drivers/gpu/drm/i915/intel_display.c:6330 intel_modeset_check_state+0x112/0x870
[i915]()
[   33.230472] attached crtc is active, but connector isn't

At unplugging DP:

[  218.764695] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in
has_drrs (expected 1, found 0)
[  218.764706] ------------[ cut here ]------------
[  218.764739] WARNING: CPU: 3 PID: 988 at
drivers/gpu/drm/i915/intel_display.c:12691
intel_modeset_check_state+0x5a4/0x870 [i915]()
[  218.764741] pipe state doesn't match!

Note that this is the patched kernel based on vanilla 4.2 and pulling
drm-intel-next-fixes (commit 4e3d1e26c2b2c40ebff69f2825fa862bfcf082d1).

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