[Bug 91428] New: [HSW] *ERROR* crtc 21: Can't calculate constants, dotclock = 0!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91428

            Bug ID: 91428
           Summary: [HSW]  *ERROR* crtc 21: Can't calculate constants,
                    dotclock = 0!
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: andreas.reis at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Getting said error both on my HSW 4200U and 4770. No apparent consequences or
related dmesg lines. Driver module is compiled-in.

[drm:drm_calc_timestamping_constants] *ERROR* crtc 21: Can't calculate
constants, dotclock = 0!

Kernel is drm-nightly-intel started with i915_enable_rc6=7. On 4770:

[    0.796626] [drm] Initialized drm 1.1.0 20060810
[    0.796908] [drm] Memory usable by graphics device = 2048M
[    0.796909] [drm] VT-d active for gfx access
[    0.796910] checking generic (d0000000 300000) vs hw (d0000000 10000000)
[    0.796910] fb: switching to inteldrmfb from EFI VGA
[    0.796918] Console: switching to colour dummy device 80x25
[    0.796955] [drm] Replacing VGA console driver
[    0.801751] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    0.801752] [drm] Driver supports precise vblank timestamp query.
[    0.801761] [drm] DMAR active, disabling use of stolen memory
[    0.801803] vgaarb: device changed decodes:
PCI:0000:00:02.0,olddecodes=io+mem,decodes=none:owns=io+mem
[    0.868011] [drm:drm_calc_timestamping_constants] *ERROR* crtc 21: Can't
calculate constants, dotclock = 0!
[    0.873265] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[    0.873534] acpi device:60: registered as cooling_device13
[    0.873571] input: Video Bus as
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input2
[    0.873582] [drm] Initialized i915 1.6.0 20150717 for 0000:00:02.0 on minor
0

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