[Bug 95176] LCD flickering on Thinkpad T440p (Haswell) with kernel 4.6-rc4 (PSR enabled)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95176

--- Comment #47 from Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> ---
(In reply to ExecutorElassus from comment #44)
> I have a new-ish MSI laptop. With no kernel option set (I'm using a gentoo
> 4.6.3 kernel atm), the screen flickers rapidly, unless the mouse is moving
> (in which case the screen is steady). If I set i915.enable_psr=0 in the
> kernel options at boot, the screen does not flicker, but it also does not
> update *at all* unless I move the mouse. That is:
> 
> 1) type some commands and hit enter → nothing changes on screen
> 2) move the mouse → the screen updates, showing that the commands have run
> and showing output.
> 
> Both of these states (ie, flickers, or no flicker but also no refresh,
> unless the mouse is moving) render my laptop more or less unusable. What are
> the other possible ways to fix this? Does danvert's patch resolve the issue?

Danvet's patch won't help if PSR is not enabled.

Can you do a `cat /sys/kernel/debug/dri/0/i915_edp_psr_status` to confirm PSR
is not enabled?

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