[Bug 95064] [bdw-U] [broadwell-u] CPU/GPU halt for multiple display configurations i915 i5-5200U i5-5287U system freeze get-around: i915.enable_rc6=0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95064

--- Comment #11 from maria guadalupe <maria.g.perez.ibarra at intel.com> ---
(In reply to Harry from comment #10)
> I did some tests and concluded that setting kernel command line parameter
> i915.enable_rc6=0
> made Wayland not crash anymore
> - it appears acceleration is then off in Wayland
> - GNOME 3.18/Wayland crashed within minutes
> 
> the setting can be checked:
> cat /sys/module/i915/parameters/enable_rc6
> 0
> 
> documentation:
> modinfo i915 | less
> 
> rC-state is from ACPI, c0 is power on, c6 is deep power down, possibly off.
> 
> had no effect:
> intel_idle.max_cstate=1
> intel_pstate=disable
> 
> was already set:
> for g in /sys/devices/system/cpu/cpu[0-9]/cpufreq/scaling_governor; do  
> echo powersave > $g;   echo cpu$i: $(cat $g);   ((i++)); done

setted kernel command line parameter i915.enable_rc6=0 and These issue is not
reproduced and hardware acceleration is active with the following configuration

=== Software information ===    
Kernel version  4.8.0-rc4drm-intel-nighly-ww36-commit-f91144a+
Linux distribution      Ubuntu 16.04.1 LTS
Architecture    64-bit
Mesa version    11.2.2 (git-3a9f628
xf86-video-intel version        2.99.917
DRM version     2.4.70
Cairo version   1.15.2
Bios revision   1.69
KSC revision    1.69

 === Hardware information ===   
Platform        BDW
Motherboard type        Lenovo G50-80 Notebook
Motherboard manufacturer        LENOVO
CPU family      Core i5
CPU information Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz
GPU Card        Intel Corporation Broadwell-U Integrated Graphics (rev 09)
(prog-if 00 [VGA controller])
Memory ram      6 GB
Maximum memory ram allowed      16 GB
Hard drive capacity     74GiB (80GB)

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