linux-kernel - Re: [Intel-gfx] 4.8-rc1: it is now common that machine needs re-run of xrandr after resume

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Date:   Wed, 14 Sep 2016 11:33:56 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Pavel Machek <pavel@....cz>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        daniel.vetter@...el.com, jani.nikula@...ux.intel.com,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [Intel-gfx] 4.8-rc1: it is now common that machine needs re-run
 of xrandr after resume

On Tue, Sep 13, 2016 at 11:04:37PM +0200, Pavel Machek wrote:
> Hi!
> 
> > I have
> > 
> > 00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset
> > Integrated Graphics Controller (rev 03)
> > 
> > In previous kernels, resume worked ok. With 4.8-rc1, I quite often (1
> > in 10 resumes?) get in state where primary monitor (DVI) is dead (in
> > powersave) and all windows move to secondary monitor (VGA). Running
> > "xrandr" fixes that.
> > 
> > I'll update to newer rc and see if it happens again, but if you have
> > any ideas, now would be good time.
> 
> Ok. With -rc6, X are completely broken. I got notification "could not
> restore CRTC config for screen 63" or something like that, and window
> manager just does not start.
> 
> X log is attached as delme, kernel log as delme2. Nothing too
> suspicious :-(.

[   234.547] (EE) intel(0): failed to set mode: Permission denied
upon resume.

There is a VT switch so there should be a DropMaster, SetMaster combo
across resume, but that didn't flag any errors. I couldn't see any sign
of logind (so no revocation), so just some breakage in the setmaster
reauthentication?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre