crash when loading intelfb on D945GSEJT board

crash when loading intelfb on D945GSEJT board

[Oliver Seitz]

Hi.

I can not make intelfb run on intel board D945GSEJT. I've tried a very 
clean setup, here's what I've done:

 > Install a minimal debian squeeze (stable)

$ wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.37.tar.bz2
$ tar -xf linux-2.6.37.tar.bz2
$ cd linux-2-6-37
$ make defconfig

 > using "make menuconfig", I enabled "Configure standard features", 
disabled "i915", enabled as module "intelfb" with "intelfb_debug"

$ make
$ make modules_install
$ update-initramfs -c -k 2.6.37
$ make install
$ update-grub

When rebooting, the machine crashes in the init sequence by performing a 
reboot, over and over again. Starting the old kernel, I did:

$ echo "blacklist intelfb" >>/etc/modprobe.d/fbdev-blacklist.conf

Now, the machine boots to a working text mode.

$ modprobe intelfb idonly
FATAL: Error inserting intelfb (/path/to/module/intelfb.ko): No such device

The commands

$ modprobe intelfb probeonly
and
$ modprobe intelfb noregister

execute without error, the module is loaded

The commands

$ modprobe intelfb noinit
and
$ modprobe intelfb

lead to a crash by instant reboot.

Have I done something wrong, or is the 2.6.37 intelfb module broken?

Greets,
Kiste

Re: crash when loading intelfb on D945GSEJT board

[Oliver Seitz]

Oh, it seems like I used the wrong driver. intelfb seems to support only 
i965 up, so for i945 I seem to have to use i915. I'll try again.

Greets,
Kiste

Re: crash when loading intelfb on D945GSEJT board

[Julien Cristau]

On Sun, Feb 13, 2011 at 08:50:07 +0100, Oliver Seitz wrote:

> Hi.
> 
> I can not make intelfb run on intel board D945GSEJT. I've tried a
> very clean setup, here's what I've done:
> 
Why would you want to use intelfb?

Cheers,
Julien

Re: crash when loading intelfb on D945GSEJT board

[Oliver Seitz]

On 13.02.2011 11:34, Julien Cristau wrote:
> On Sun, Feb 13, 2011 at 08:50:07 +0100, Oliver Seitz wrote:
>
>> Hi.
>>
>> I can not make intelfb run on intel board D945GSEJT. I've tried a
>> very clean setup, here's what I've done:
>>
> Why would you want to use intelfb?

I did not want to use X, framebuffer is sufficient in my case. So, just 
by the name, I (seemingly wrong) thought intelfb was the right module.

I'm now trying i915. Sorry for the noise.

Greets,
Kiste

Re: crash when loading intelfb on D945GSEJT board

[Tino Keitel]

On Sun, Feb 13, 2011 at 12:19:42 +0100, Oliver Seitz wrote:
> On 13.02.2011 11:34, Julien Cristau wrote:
> >On Sun, Feb 13, 2011 at 08:50:07 +0100, Oliver Seitz wrote:
> >
> >>Hi.
> >>
> >>I can not make intelfb run on intel board D945GSEJT. I've tried a
> >>very clean setup, here's what I've done:
> >>
> >Why would you want to use intelfb?

I think Julien meant that intelfb should not be used except for special
embedded hardware. It's recommended to use KMS and its drmfb.

Regards,
Tino

Re: crash when loading intelfb on D945GSEJT board

[Oliver Seitz]

>>> Why would you want to use intelfb?
>
> I think Julien meant that intelfb should not be used except for special
> embedded hardware. It's recommended to use KMS and its drmfb.

Ah,ok, the application indeed resemles an embedded system: It's always 
the same motherboard connected to the same LVDS panel, always running 
the same program at the same resolution. VGA output could occasionally 
be used for debugging purposes if possible.

The only thing that's coming from the consumer market is the motherboard.

Greets,
Kiste

Re: crash when loading intelfb on D945GSEJT board

[Tino Keitel]

On Sun, Feb 13, 2011 at 18:58:21 +0100, Oliver Seitz wrote:
> 
> >>>Why would you want to use intelfb?
> >
> >I think Julien meant that intelfb should not be used except for special
> >embedded hardware. It's recommended to use KMS and its drmfb.
> 
> Ah,ok, the application indeed resemles an embedded system:

[...]

> The only thing that's coming from the consumer market is the motherboard.

So it sounds not that special regarding graphics, but more like
standard hardware.

Regards,
Tino

Re: crash when loading intelfb on D945GSEJT board

[Oliver Seitz]

> So it sounds not that special regarding graphics, but more like
> standard hardware.

The part of the hardware the graphics drivers have to deal with, yes. So 
now I'm sure i915 is the right driver, not intelfb.

Thanks again!

Kiste