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

[Jani Nikula <jani.nikula@linux.intel.com>]

On Sat, 10 Oct 2015, Darren Hart <dvhart@infradead.org> 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@intel.com>

But we don't start hitting the warning right away with that commit, do
we? There's a bug about this with a bisected bad commit [1], please
let's track this there.

Thanks,
Jani.


[1] https://bugs.freedesktop.org/show_bug.cgi?id=92084


>
> 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

-- 
Jani Nikula, Intel Open Source Technology Center