linux-kernel - Re: [Intel-gfx] Suspend To RAM failure in >= 4.1 - bissected to "drm/i915: Track GEN6 page table usage"

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Date:	Tue, 5 Jan 2016 08:01:01 +0100
From:	Sylvain Munaut <246tnt@...il.com>
To:	Ben Widawsky <benjamin.widawsky@...el.com>
Cc:	Pavel Machek <pavel@....cz>, intel-gfx@...ts.freedesktop.org,
	Sylvain Munaut <s.munaut@...tever-company.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] Suspend To RAM failure in >= 4.1 - bissected to
 "drm/i915: Track GEN6 page table usage"

Hi,

>> Can you verify that reverting this patch (on top of 4.4?) fixes it?
>>
>> If so, is it time to revert it?
>>
>> Thanks,
>>                                                                       Pavel
>
> It's highly unlikely you'll be able to revert this on top of 4.4. Unfortunately,
> this is the cornerstone of a whole lot of infrastructure needed to support the
> per process page tables.

Yes, that's what it looked like to me too.

When bisecting I was hoping to find an isolated change I could just
revert but this definitely looked like a change other commits depended
on in a series of commit.


> I assume suspend to disk is also failing?

I have no idea. I never used suspend-to-disk and this laptop isn't
setup for it (no swap and no non-encrypted partitions). I could try to
set it up on an external USB drive if you think that can help debug
the issue.


Cheers,

    Sylvain
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