Bug 93924

Summary: [APL] No log showing DC6 state
Product: DRI Reporter: cprigent <christophe.prigent>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED NOTABUG QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: BXT i915 features: power/runtime PM
Attachments:
Description Flags
dmesg_dc-status none

Description cprigent 2016-01-29 10:52:11 UTC 
Created attachment 121387 [details]
dmesg_dc-status

Setup:
======
Platform: Broxton P A0 Platform
CPU Name : Intel(R) @ 1.2 GHz (family: 6, model: 92, stepping: 8) – 4 cores
SoC : BROXTON-P A0
CRB :  Apollo Lake RVPC1 Fab1 
Reworks : R14, R06C and R16

Software:
=========
BIOS (IFWI Version): APLK_IFWI_X64_R_2015_41_5_02 
KSC : 1.02
Linux distribution: Ubuntu 15.10 64 bits
Kernel: drm-intel-nightly 4.4.0 8114b00 from http://cgit.freedesktop.org/drm-intel/
drm: tag libdrm-2.4.66 e342c0f from http://cgit.freedesktop.org/mesa/drm/
mesa: tag mesa-11.0.8 261daab from http://cgit.freedesktop.org/mesa/mesa/
cairo: tag 1.15.2 db8a7f1 from http://cgit.freedesktop.org/cairo
waffle: master bb29b2a from https://github.com/waffle-gl/waffle
xorg-server-macros: master d7acec2 from git://git.freedesktop.org/git/xorg/util/macros
libva: tag libva-1.6.1 cb418f6 from http://cgit.freedesktop.org/libva/
vaapi-intel-driver: tag 1.6.1 2110b3a from http://cgit.freedesktop.org/vaapi/intel-driver

Steps:
------
1. Boot in text mode
2. Let the system idle
3. Execute command: dmesg |grep DC

Actual result:
---------------
3. Command returns:
[    0.785079] [drm:intel_power_well_enable] enabling DC off
[    0.785080] [drm:gen9_set_dc_state] Setting DC state from 00 to 00
[    0.785083] [drm:gen9_set_dc_state] Setting DC state from 00 to 00

Expected result:
----------------
3 Log shows DC6 status: 
[enable_dc6] Enabling DC6

Info:
-----
I was able to see DC9 status
Comment 1 cprigent 2016-01-29 11:19:13 UTC 
DMC used: https://01.org/linuxgraphics/downloads/broxton-dmc-1.06
Comment 2 cprigent 2016-01-29 15:59:03 UTC 
Reproduced with all PM options activated in Bios (S0ix, Cx, PCx, Render C6, GT PM ...)
Comment 3 Imre Deak 2016-02-02 11:04:41 UTC 
(In reply to cprigent from comment #2)
> Reproduced with all PM options activated in Bios (S0ix, Cx, PCx, Render C6,
> GT PM ...)

Runtime PM disabled atm on BXT due to stability issues. We will re-enable it once these problems are fixed.
Comment 4 cprigent 2016-04-29 10:30:05 UTC 
Let's close it as not a bug. It will be tested again.

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