[Bug 91436] PSR screen freeze after modesetting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91436

--- Comment #22 from ivan <ivan.mitev at gmail.com> ---
Hi Rodrigo,

I've tested the psr-ivan-v7 branch, it works well (even with enable_fbc=1) !

I wanted to work a little bit with that kernel to see how power consumption
would improve so I compiled the same kernel but with the debug patch reverted
(commit cf6e97774936be7e47eb2c0805b14db6412c14ae)

But then, with this kernel:

- with enable_psr=0 at boot : OK

- with enable_psr=1 at boot: intermittent freezes like described before. The
problem doesn't go away when I later set enable_psr to 0
(/sys/module/i915/parameters/enable_psr).

I could consistently reproduce the problem.

I see the debug patch also commented something related to timing. I'll try to
keep only those comments and remove the verbose stuff and see if the problems
goes away.

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