[Bug 110821] [HSW] Complete Lockup on Battery Power

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=110821

Luca Di Maio <luca.dimaio1 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|blocking                    |high

--- Comment #8 from Luca Di Maio <luca.dimaio1 at gmail.com> ---
UPDATE:
Moved to DRI/Intel and lowered to high importance because it seems connected to
the flag:

i915.enable_fbc=1

It's strange that on 4.2.3 works wonderfully and on 4.3.3+ freezes completely.
But I can use the PC without it.

Output of "tail /sys/kernel/debug/dri/0/i915_capabilities"

has_fbc: yes
has_pipe_cxsr: no
has_hotplug: yes
cursor_needs_physical: no
has_overlay: no
overlay_needs_physical: no
supports_tv: no
has_llc: yes
has_ddi: yes
has_fpga_dbg: yes

so Frame buffer Compression is supported on the HW.

Still  /sys/class/drm/card0/error shows no error after a Lockup.

I still leave it to "High" because it is an important feature to add power
saving to the laptop.

Without it, my turbostat says that PC3 is only about 20-25% of time (and its is
max value), with FBC it stays on PC3 85/90% of the time (can't go deeper than
pc3 sadly)

It translates to about 3-4w higher power consumpion in idle/light workload. It
seems to not affect high workload.

If I can do more to help debugging I will do it gladly!

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