[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 #45 from Dennis Brünig <mail at dennis-bruenig.de> ---
(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?

dell xps 13 2015. Arch Linux, latest X11 server with xf86-video-intel, default
options except dri3.

When enable_psr=1 is set: Similar problem as Executor has with screen not
refreshing unless mouse moved BUT this is only happening AFTER first/second
return from dpms screen blanking. 

In this state the device might also freeze when trying to manually activate
suspend to ram (automatic suspend to ram works when timeout reached). 

This state returns to normal after resuming (returning from suspend to ram).

This state does not appear with enable_psr=0.

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