From: Paulo Zanoni <paulo.r.zanoni at intel.com> Hi Here's a new series that tries to report FIFO underruns. The new implementation is completely different from the old one, due to the reviews I received. Now we don't just "ignore" the FIFO underrun interrupts when we receive them, we effectively disable the interrupts (the downsides of this approach are documented in the commit message of patch 2). We will still see at most one of each error FIFO underrun message per mode set, so this is not really going to flood dmesg. I tested this series on ILK, SNB and HSW, and I am only seeing FIFO underruns on ILK when using 2 monitors (LVDS+HDMI). I'll work on a patch to fix this message later (at least now we know we have problems!). It seems not everybody is in favor of adding the "poison" error message, so the "print poison interrupts" patch comes _after_ the "print FIFO underruns". We can discard the patch if we conclude we don't want it. I haven't seen the poison message on any of my tests. Thanks, Paulo Paulo Zanoni (4): drm/i915: also disable south interrupts when handling them drm/i915: report Gen5+ CPU and PCH FIFO underruns drm/i915: print Gen5+ CPU/PCH poison interrupts drm/i915: remove "inline" keyword from ironlake_disable_display_irq drivers/gpu/drm/i915/i915_irq.c | 345 ++++++++++++++++++++++++++++++++-- drivers/gpu/drm/i915/i915_reg.h | 15 +- drivers/gpu/drm/i915/intel_display.c | 17 +- drivers/gpu/drm/i915/intel_drv.h | 10 + 4 files changed, 371 insertions(+), 16 deletions(-) -- 1.7.10.4
