Bug 93922

Summary: [APL] DUT does not boot with i915.disable_power_well=1
Product: DRI Reporter: cprigent <christophe.prigent>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: BXT i915 features: power/Other, power/runtime PM

Description cprigent 2016-01-29 09:33:56 UTC
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

Purpose of the test:
--------------------
Check if LPSP allows power saving

Steps:
------
1. Disconnect external screens
2. Boot with i915.disable_power_well=0
3. Measure idle power with a power meter
4. Reboot with i915.disable_power_well=1
5. Measure idle power with a power meter
6. Compare 3 and 5

Actual results:
---------------
4. DUT does not boot. Reset needed

Expected result:
-----------------
4. DUT boots successfully

If needed I will try to collect serial logs
Comment 1 Jani Nikula 2016-12-28 12:48:34 UTC
Presumed fixed in current kernels and production hw, closing.

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