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From:   Ilia Mirkin <imirkin@alum.mit.edu>
Date:   Fri, 17 Nov 2017 09:43:33 -0500
Message-ID: <CAKb7UvgEyKTHK3JMrEdLrMXZP0SAPH9opDFGAWjeFCw4s+NEUA@mail.gmail.com>
Subject: Re: Blank console but X11 works on MCP79 - old regression since 3.8
To:     Ondrej Zary <linux@rainbow-software.org>
Cc:     Ben Skeggs <bskeggs@redhat.com>,
        "nouveau@lists.freedesktop.org" <nouveau@lists.freedesktop.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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With a new kernel, mind grabbing a dmesg with drm.debug=0x1e
nouveau.debug=debug (or maybe even =trace)? Maybe also see if
fbcon/fbdev have any debug things that can be turned on?

Sounds like things are generally working, just the fbcon -> nouveaufb
path seems somehow buggered.

Another thing to try would be nouveau.atomic=1

On Fri, Nov 17, 2017 at 9:26 AM, Ondrej Zary <linux@rainbow-software.org> wrote:
> Hello,
> I've just been hit by this old bug which is still present in 4.14:
> https://bugs.freedesktop.org/show_bug.cgi?id=80675
>
> On MCP79 (ION), when stolen memory is set to 32MB in BIOS, console is blank
> but X11 works. When the stolen memory is increased to 64MB, console works
> fine.
>
> Bisected it to this:
>
> 4f6029da58ba9204c98e33f4f3737fe085c87a6f is the first bad commit
> commit 4f6029da58ba9204c98e33f4f3737fe085c87a6f
> Author: Ben Skeggs <bskeggs@redhat.com>
> Date:   Fri Nov 16 11:54:31 2012 +1000
>
>     drm/nv50-nvc0: switch to common disp impl, removing previous version
>
>     Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
>
> It's a big change so I'm not able to do more debugging.
>
> --
> Ondrej Zary

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