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From:   Martin Steigerwald <martin@lichtvoll.de>
To:     "Rafael J. Wysocki" <rafael@kernel.org>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Intel Gfx Mailing List <intel-gfx@freedesktop.org>,
        Thorsten Leemhuis <regressions@leemhuis.info>
Subject: Re: [REGRESSION 4.19-rc2] sometimes hangs with black screen when resuming from suspend or hibernation (was: Re: Linux 4.19-rc2)
Date:   Tue, 11 Sep 2018 12:17:05 +0200
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Cc´d Intel Gfx mailing list, in case somebody there knows something:

Cc´d Thorsten for regression tracking… forgot initially. Can also open 
bug report at a later time but so far I cannot provide many details 
about the issue.

Rafael J. Wysocki - 11.09.18, 10:17:
> On Tue, Sep 11, 2018 at 10:01 AM Martin Steigerwald 
<martin@lichtvoll.de> wrote:
> > Hi.
> > 
> > Linus Torvalds - 02.09.18, 23:45:
> > > As usual, the rc2 release is pretty small. People are taking a
> > 
> > With 4.19-rc2 this ThinkPad T520 with i5 Sandybrdige sometimes hangs
> > with black screen when resuming from suspend or hibernation.  With
> > 4.18.1 it did not. Of course there have been userspace related
> > updates that could be related.
> > 
> > I currently have no time to dig into this and on this production
> > laptop I generally do not do bisects between major kernel releases.
> > So currently I only answer questions that do not require much time
> > to answer.
> > 
> > For now I switched back to 4.18. If that is stable – and thus likely
> > no userspace component is related –, I go with 4.19-rc3 or whatever
> > is most recent version to see if the issue has been fixed already.
> 
> There were almost no general changes related to system-wide PM between
> 4.18 and current, so I would suspect one of the device drivers or the
> x86 core.  It also may be something like CPU online/offline, however.

I see. I wondered about intel-gfx driver already. Of course it could 
also be something else.

I forgot to mention: The mouse pointer was visible, but the screen 
remained black. That may again point away from Intel gfx driver. There 
has been a MESA update in between in userspace.

Currently running 4.18.7 to make sure it is no userspace issue.

Thanks,
-- 
Martin