linux-kernel - Regression for Power PC in 4.14-rc0 - bisected to commit 31bfdb036f12

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Message-ID: <9ee6b20f-c459-6986-fb9d-8aaea1bb8660@lwfinger.net>
Date:   Wed, 13 Sep 2017 19:07:11 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...abs.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, linuxppc-dev@...ts.ozlabs.org
Subject: Regression for Power PC in 4.14-rc0 - bisected to commit 31bfdb036f12

When booting my PowerBook Aluminum G4, I get a pop-up screen that says "The 
system is running in low-graphics  mode. Your screen, graphics card, and input 
device settings could not be detected correctly. You will need to configure 
these yourself." This is a big-endian 74xx CPU. The lscpu command says it is a 
PowerBook5,6 model.

This problem has been bisected to commit 31bfdb036f12 ("powerpc: Use instruction 
emulation infrastructure to handle alignment faults"). I am confident of the 
accuracy of the bisection.

Attached is the configuration.

Thanks,

Larry

View attachment "config_ppc" of type "text/plain" (98071 bytes)