Since lastest GIT releses of xf86-video-intel I have two warnings about GMBUS i915 dpb time out. [ 3.963578] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5 [ 4.240243] [drm] GMBUS [i915 gmbus dpd] timed out, falling back to bit banging on pin 6 This happened on Linux 4.5 AND Linux 4.6RC3 GPU: 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device 1447 Flags: bus master, fast devsel, latency 0, IRQ 25 Memory at f7400000 (64-bit, non-prefetchable) [size=4M] Memory at d0000000 (64-bit, prefetchable) [size=256M] I/O ports at f000 [size=64] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Capabilities: [a4] PCI Advanced Features Kernel driver in use: i915 Kernel modules: i915
Created attachment 122857 [details] DMESG-46rc3 NOTE: I have [ 1.379221] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A [ 1.379264] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun too but I just muted them (still available in debug)
(In reply to FadeMind from comment #0) > Since lastest GIT releses of xf86-video-intel I have two warnings about > GMBUS i915 dpb time out. > > [ 3.963578] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit > banging on pin 5 > [ 4.240243] [drm] GMBUS [i915 gmbus dpd] timed out, falling back to bit > banging on pin 6 That's actually perfectly normal, which means we shouldn't spam dmesg with it needlessly. Some time ago I posted a patch to silence this: https://lists.freedesktop.org/archives/intel-gfx/2016-March/089133.html Just need to get someone to review it.
commit 706778013bc5ee97970de3a2deee80b007e29c25 Author: Ville Syrjälä <ville.syrjala@linux.intel.com> Date: Mon Mar 7 17:57:00 2016 +0200 drm/i915: Make GMBUS timeout message DRM_DEBUG_KMS
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