v4.3-rc4: i915: ThinkPad Yoga 12: *ERROR* The master control interrupt lied (SDE)!

[Darren Hart]

The Debian 3.16.0 kernel does not emit the error, but I have not attempted a
bisection.

The warning was added by:
38cc46d drm/i915/bdw: Ack interrupts before handling them (GEN8)
 2014-06-18 (1 year, 4 months ago), Oscar Mateo <oscar.mateo at intel.com>

Follows: v3.15-rc8
Preceedes: 3.17-rc1

This is not present in v3.16, so perhaps not present in the Debian kernel and
this is not a regression, but just reporting the condition as intended.

Linux Version: v4.3-rc4
Platform: Lenovo ThinkPad Yoga 12
OS: Debian 8.2

$ dmesg | grep -i drm
[   10.918367] [drm] Initialized drm 1.1.0 20060810
[   11.235005] [drm] Memory usable by graphics device = 4096M
[   11.235009] fb: switching to inteldrmfb from simple
[   11.235093] [drm] Replacing VGA console driver
[   11.241160] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   11.241162] [drm] Driver supports precise vblank timestamp query.
[   11.256249] [drm:drm_calc_timestamping_constants [drm]] *ERROR* crtc 21: Can't calculate constants, dotclock = 0!
[   11.326946] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
[   11.344097] [drm] Initialized i915 1.6.0 20150731 for 0000:00:02.0 on minor 0
[   11.344913] fbcon: inteldrmfb (fb0) is primary device
[   12.462509] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[   12.466498] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[   12.794359] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[   13.869733] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[   13.869894] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[   13.870058] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[   22.656986] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[  257.506246] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[  257.506415] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[  257.506584] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[  257.506746] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[  278.722570] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[  278.722744] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[  278.722908] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[ 1857.776390] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[ 1857.776549] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[ 1857.776710] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
[ 4057.592685] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!

-- 
Darren Hart
Intel Open Source Technology Center