linux-kernel - Problems with fb console [was Re: 2.6.12-rc4-mm2]

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Message-ID: <20070627023527.5e643e32@werewolf-wl>
Date:	Wed, 27 Jun 2007 02:35:27 +0200
From:	"J.A. Magallón" <jamagallon@....com>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Problems with fb console [was Re: 2.6.12-rc4-mm2]

On Mon, 16 May 2005 02:13:02 -0700, Andrew Morton <akpm@...l.org> wrote:

> 
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.12-rc4/2.6.12-rc4-mm2/
> 
> 

Hi...

I have a (stupid, I suppose) problem with framebuffer console.
I have builtin VESAFB in this kernel, so:

werewolf:/boot# grep _FB config-2.6.21-jam09 | grep =y
CONFIG_FB=y
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_IMAGEBLIT=y
CONFIG_FB_DEFERRED_IO=y
CONFIG_FB_MODE_HELPERS=y
CONFIG_FB_VESA=y
werewolf:/boot# grep CONSO config-2.6.21-jam09
# CONFIG_NETCONSOLE is not set
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
# CONFIG_VT_HW_CONSOLE_BINDING is not set
CONFIG_VGA_CONSOLE=y
CONFIG_DUMMY_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE=y
# CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY is not set
# CONFIG_FRAMEBUFFER_CONSOLE_ROTATION is not set

I put this line in grub's menu.lst:

kernel /boot/vmlinuz video=vesafb:mtrr,ywrap vga=0x31A ro root=/dev/sdc1

(tried both with hex and decimal).

but grub keeps telling me it can't set that video mode, and I have no
/dev/fb0 device to try with fbset. I have a '29 fb' line in /proc/devices.

Any ideas about why the device is missing ? udev is 113...
I have followed al the info I could get (linux/Documentation/fb/, Google ;) )
and all say that what I'm doing should work. What am I doing wrong ?

TIA

--
J.A. Magallon <jamagallon()ono!com>     \               Software is like sex:
                                         \         It's better when it's free
Mandriva Linux release 2008.0 (Cooker) for i586
Linux 2.6.21-jam09 (gcc 4.1.2 20070302 (4.1.2-1mdv2007.1)) SMP PREEMPT
09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
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