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

[Jean-Christian de Rivaz]

Le 12. 10. 15 09:06, Daniel Vetter a écrit :
> Another regression for Jairo to track.
> -Daniel

I get the exact same dmesg too with the 4.3.0-rc5 on a i5-5250U NUC 
using HDMI. The rest is a standard Debian Jessie.

> On Sat, Oct 10, 2015 at 12:08:43PM -0700, Darren Hart wrote:
>> 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