Created attachment 121163 [details] dmesg with drm.debug Reproduce: Connect 3 displays, boot to Xorg, press ctrl-alt-f1 Result: fifo underrun, both displays power off dmesg: [ 9.755511] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe B [ 9.755513] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe C [ 9.755519] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder B [ 9.755523] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder C [ 9.761398] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe B [ 9.761400] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe C [ 9.761407] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder B [ 9.761411] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder C [ 9.774117] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe C [ 9.774125] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder C bisect result (commit was merged in to the Linus tree 3 days ago in 984065055e6e): 92826fcdfc147a7d16766e987c12a9dfe1860c3f is the first bad commit commit 92826fcdfc147a7d16766e987c12a9dfe1860c3f Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Date: Thu Dec 3 13:49:13 2015 +0100 drm/i915: Calculate watermark related members in the crtc_state, v4. This removes pre/post_wm_update from intel_crtc->atomic, and creates atomic state for it in intel_crtc. Changes since v1: - Rebase on top of wm changes. Changes since v2: - Split disable_cxsr into a separate patch. Changes since v3: - Move some of the changes to intel_wm_need_update. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/56603A49.5000507@linux.intel.com Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> :040000 040000 b97b4b2338e1da2ee9e93791154b4deb2ecaf8b6 ae91735a668b6785e55122c646dbca93b54eb8c9 M drivers
Shutdown log shows all pipes overflow when Xorg exits: [ 1015.463379] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared fifo underrun on pipe A [ 1015.463386] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun [ 1015.463400] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared pch fifo underrun on pch transcoder A [ 1015.463403] [drm:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder A FIFO underrun [ 1015.572966] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe B [ 1015.572967] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe C [ 1015.572970] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder B [ 1015.572973] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder C [ 1015.582403] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe B [ 1015.582405] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe C [ 1015.582411] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder B [ 1015.582415] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder C [ 1015.593548] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo underrun on pipe C [ 1015.593553] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun on pch transcoder C
These may be worth a try: http://patchwork.freedesktop.org/patch/msgid/1452776015-22076-2-git-send-email-ville.syrjala@linux.intel.com http://patchwork.freedesktop.org/patch/msgid/1452776015-22076-1-git-send-email-ville.syrjala@linux.intel.com
No change with those patches - switching to tty1 still results in the same error. I just noticed pipe A underruns in the original dmesg, but that monitor did not go to standby (monitors are same model).
Same Problem here. First occured after upgrade to 4.4 and still exists in 4.5rc4.
Is this issue still seen with latest kernel?
I don't see this any more with 4.9.0
(In reply to Chris Bainbridge from comment #6) > I don't see this any more with 4.9.0 Thanks Chris for your feedback. Closing as fixed.
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