linux-kernel - Re: gma500: Attempting to load psb_gfx causes NULL pointer dereference error

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Message-ID: <CAMeQTsZFhWi5WNTrS0=OMibtPJpv-8EQq7ZN=+Ar3F8qN8iqsQ@mail.gmail.com>
Date:	Sun, 25 Dec 2011 01:09:41 +0100
From:	Patrik Jakobsson <patrik.r.jakobsson@...il.com>
To:	"Dainius (GreatEmerald)" <pastas4@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: gma500: Attempting to load psb_gfx causes NULL pointer
 dereference error

On Sat, Dec 24, 2011 at 9:36 PM, Dainius (GreatEmerald)
<pastas4@...il.com> wrote:
> When attempting to launch a Linux system with any kernel version with
> psb_gfx, I always get an error at boot time. The error includes these
> lines:
>
>    ioremap error for 0x7f579000-0x7f57a000, requested 0x10, got 0x0
>    BUG: unable to handle kernel NULL pointer dereference at   (null)
>    Oops: 0000 [#1] SMP
>
> The full error message and a stack trace can be found here:
> On openSUSE with kernel 3.1.0 - http://pastebin.com/raw.php?i=ABfX7rJQ
> On Kubuntu with kernel 3.2.0 - http://paste.ubuntu.com/781414/
>
> The device I'm using is running on the Oak Trail platform (it's a
> Fujitsu Stylistic Q550 tablet).
>
> One strange thing about it is if I try to boot the system with the
> vga=0x318 option, it throws me this error on boot, but it still loads
> the X server, although with the non-native resolution and seemingly
> without backlight control and other features. It still seems that the
> psb_gfx driver is running, however, since lsmod lists it and fbdev
> seems to be running. And if I don't pass the vga option, the X server
> crashes, complaining about /dev/fb0 not existing and fbdev failing to
> load.

Could this be a vesa driver clash? Try blacklisting vesafb and make sure
X is using the fbdev driver. Vesa and psb_gfx doesn't play well together.

Patrik
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