Framebuffer console not working with matroxfb on 2.6

Framebuffer console not working with matroxfb on 2.6

[Michal 'hramrach' Suchanek]

Hello

I tried using the framebuffer console with matroxfb on a 2.6 kernel and
I see only reddish pattern on the screen. I do not get any letters.
However, I can run X with UseFBdev option and a directfb program.
I can also use the fbcons on an iMac with atifb.
Tested with 2.6.7, with 2.6.8.1 I still do not get usable fbcons.
THe hardware is G400 and G550.

Thanks

Michal Suchanek


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Re: Framebuffer console not working with matroxfb on 2.6

[Petr Vandrovec]

On 15 Sep 04 at 8:09, Michal 'hramrach' Suchanek wrote:
> I tried using the framebuffer console with matroxfb on a 2.6 kernel and
> I see only reddish pattern on the screen. I do not get any letters.
> However, I can run X with UseFBdev option and a directfb program.
> I can also use the fbcons on an iMac with atifb.
> Tested with 2.6.7, with 2.6.8.1 I still do not get usable fbcons.
> THe hardware is G400 and G550.

Your .config ?  You either did not build fbcon to the kernel or
you are using modular matroxfb.  You cannot do that.
                                                    Petr
                                                    



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Re: Framebuffer console not working with matroxfb on 2.6

[Antonino A. Daplas]

On Wednesday 15 September 2004 14:09, Michal 'hramrach' Suchanek wrote:
> Hello
>
> I tried using the framebuffer console with matroxfb on a 2.6 kernel and
> I see only reddish pattern on the screen. I do not get any letters.
> However, I can run X with UseFBdev option and a directfb program.
> I can also use the fbcons on an iMac with atifb.
> Tested with 2.6.7, with 2.6.8.1 I still do not get usable fbcons.
> THe hardware is G400 and G550.

In matroxfb_accel.c:matroxfb_imageblit(), try changing this line:

if (image->depth == 0)

to 

if (image->depth == 1)

Tony
>
> Thanks
>
> Michal Suchanek
>
>
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Re: Framebuffer console not working with matroxfb on 2.6

[Michal 'hramrach' Suchanek]

On Wed, Sep 15, 2004 at 01:06:14PM +0200, Petr Vandrovec wrote:
> On 15 Sep 04 at 8:09, Michal 'hramrach' Suchanek wrote:
> > I tried using the framebuffer console with matroxfb on a 2.6 kernel and
> > I see only reddish pattern on the screen. I do not get any letters.
> > However, I can run X with UseFBdev option and a directfb program.
> > I can also use the fbcons on an iMac with atifb.
> > Tested with 2.6.7, with 2.6.8.1 I still do not get usable fbcons.
> > THe hardware is G400 and G550.
> 
> Your .config ?  You either did not build fbcon to the kernel or
> you are using modular matroxfb.  You cannot do that.

OK, compiling it into kernel works.

But I wonder how should I know. I re-read the documentation that comes
with the kernel and I did not find any word about this.
Also it worked with 2.4 kernels.

Thanks

Michal Suchanek


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Re: Framebuffer console not working with matroxfb on 2.6

[Michal 'hramrach' Suchanek]

On Wed, Sep 15, 2004 at 09:11:49PM +0800, Antonino A. Daplas wrote:
> 
> In matroxfb_accel.c:matroxfb_imageblit(), try changing this line:
> 
> if (image->depth == 0)
> 
> to 
> 
> if (image->depth == 1)
> 
May I ask what this change is suposed to do?
As already explained the driver works if compiled into kernel as opposed
to loading it as a module. This change seems too small to fix module
loading :)

Thanks

Michal Suchanek


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Re: Framebuffer console not working with matroxfb on 2.6

[Petr Vandrovec]

On 16 Sep 04 at 12:58, Michal 'hramrach' Suchanek wrote:
> On Wed, Sep 15, 2004 at 01:06:14PM +0200, Petr Vandrovec wrote:
> > On 15 Sep 04 at 8:09, Michal 'hramrach' Suchanek wrote:
> > > I tried using the framebuffer console with matroxfb on a 2.6 kernel and
> > > I see only reddish pattern on the screen. I do not get any letters.
> > > However, I can run X with UseFBdev option and a directfb program.
> > > I can also use the fbcons on an iMac with atifb.
> > > Tested with 2.6.7, with 2.6.8.1 I still do not get usable fbcons.
> > > THe hardware is G400 and G550.
> > 
> > Your .config ?  You either did not build fbcon to the kernel or
> > you are using modular matroxfb.  You cannot do that.
> 
> OK, compiling it into kernel works.
> 
> But I wonder how should I know. I re-read the documentation that comes
> with the kernel and I did not find any word about this.
> Also it worked with 2.4 kernels.

It is not matroxfb's bug, it is how fbcon works in 2.6.x, it uses
only drivers which existed at a time fbcon was loaded...  Usually
people find it by trial & error, or they ask...

You can also grab 
http://platan.vc.cvut.cz/ftp/pub/linux/matrox-latest/matroxfb-2.6.9-rc2.gz,
with it you should be able to use modular matroxfb.
                                                    Petr
                                                    



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Re: Framebuffer console not working with matroxfb on 2.6

[Antonino A. Daplas]

On Thursday 16 September 2004 19:42, Michal 'hramrach' Suchanek wrote:
> On Wed, Sep 15, 2004 at 09:11:49PM +0800, Antonino A. Daplas wrote:
> > In matroxfb_accel.c:matroxfb_imageblit(), try changing this line:
> >
> > if (image->depth == 0)
> >
> > to
> >
> > if (image->depth == 1)
>
> May I ask what this change is suposed to do?

Because image->depth will never be equal to 0.  (The use of image->depth == 0
is long gone). Anyway, this will not explain why you don't have a console,
so my mistake.  However, matroxfb will always default to
unaccelerated imageblit with this test.  (Is matroxfb_imageblit broken?) To
use matroxfb's accelerated imageblit routine the test must be changed to

if (image->depth == 1)

Try changing it and compare the time with 'time cat /usr/src/linux/MAINTAINERS'
with and without that minor change.

(Petr, this is probably the reason why copyarea is always fast with your
driver.  Most of the time, I find that imageblit > copyarea if y-pan is
disabled, copyarea > imageblit if y-pan is enabled, and imageblit > copyarea
if acceleration is disabled, whether y-pan is enabled or not.)
 
> As already explained the driver works if compiled into kernel as opposed
> to loading it as a module. This change seems too small to fix module
> loading :)
>

This particular problem (xxxfb == module and fb console != module resulting
to no console) is not specific to matroxfb. This bug/regression should be
fixed in 2.6.9-rc2 or 2.6.9-rc1-mm5.

Tony 




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Re: Framebuffer console not working with matroxfb on 2.6

[Michal 'hramrach' Suchanek]

> It is not matroxfb's bug, it is how fbcon works in 2.6.x, it uses
> only drivers which existed at a time fbcon was loaded...  Usually
> people find it by trial & error, or they ask...
> 
> You can also grab 
> http://platan.vc.cvut.cz/ftp/pub/linux/matrox-latest/matroxfb-2.6.9-rc2.gz,
> with it you should be able to use modular matroxfb.

It does not apply to my (2.6.8.1) kernel. But since it works when
compiled into kernel I can wait until it appears in the kernel.org
kernel or a new patch is available.

However, I still get a minor problem with the driver.
When I switch between the default 640x480-60 mode and 1024x768-85 mode
the 1024x768 gets interlaced, with completely different timings. I have
to use fbset to restore it to 1024x768-85.

Thanks

Michal Suchanek

--- fb.modes
# "1024x768"     94.50   1024 1072 1168 1376    768  769  772  808 +hsync +vsync
mode "1024x768-85"
  geometry 1024 768 1024 768 8
  timings 10582  208 48  36 1  96 3
    accel true
    laced false
    vsync high
    hsync high
endmode

mode "640x480-60"
    # D: 25.176 MHz, H: 31.469 kHz, V: 59.942 Hz
    geometry 640 480 640 26214 8
    # left right upper lower hslen vslen
    timings 39721 40 24 32 11 96 2
    accel true
    #rgba 8/0,8/0,8/0,0/0
endmode

--- partial .config

#
# Graphics support
#
CONFIG_FB=y
# CONFIG_FB_CIRRUS is not set
# CONFIG_FB_PM2 is not set
# CONFIG_FB_CYBER2000 is not set
# CONFIG_FB_ASILIANT is not set
# CONFIG_FB_IMSTT is not set
# CONFIG_FB_VGA16 is not set
CONFIG_FB_VESA=y
CONFIG_VIDEO_SELECT=y
# CONFIG_FB_HGA is not set
# CONFIG_FB_RIVA is not set
CONFIG_FB_MATROX=y
# CONFIG_FB_MATROX_MILLENIUM is not set
# CONFIG_FB_MATROX_MYSTIQUE is not set
# CONFIG_FB_MATROX_G450 is not set
CONFIG_FB_MATROX_G100A=y
CONFIG_FB_MATROX_G100=y
CONFIG_FB_MATROX_I2C=m
CONFIG_FB_MATROX_MAVEN=m
# CONFIG_FB_MATROX_MULTIHEAD is not set
# CONFIG_FB_RADEON_OLD is not set
# CONFIG_FB_RADEON is not set
# CONFIG_FB_ATY128 is not set
# CONFIG_FB_ATY is not set
# CONFIG_FB_SIS is not set
# CONFIG_FB_NEOMAGIC is not set
# CONFIG_FB_KYRO is not set
# CONFIG_FB_3DFX is not set
# CONFIG_FB_VOODOO1 is not set
# CONFIG_FB_TRIDENT is not set
# CONFIG_FB_VIRTUAL is not set

#
# Console display driver support
#
CONFIG_VGA_CONSOLE=y
# CONFIG_MDA_CONSOLE is not set
CONFIG_DUMMY_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE=y
# CONFIG_FONTS is not set
CONFIG_FONT_8x8=y
CONFIG_FONT_8x16=y

#
# Logo configuration
#
CONFIG_LOGO=y
CONFIG_LOGO_LINUX_MONO=y
CONFIG_LOGO_LINUX_VGA16=y
CONFIG_LOGO_LINUX_CLUT224=y


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Re: Framebuffer console not working with matroxfb on 2.6

[Petr Vandrovec]

On 17 Sep 04 at 10:51, Michal 'hramrach' Suchanek wrote:
> > It is not matroxfb's bug, it is how fbcon works in 2.6.x, it uses
> > only drivers which existed at a time fbcon was loaded...  Usually
> > people find it by trial & error, or they ask...
> > 
> > You can also grab 
> > http://platan.vc.cvut.cz/ftp/pub/linux/matrox-latest/matroxfb-2.6.9-rc2.gz,
> > with it you should be able to use modular matroxfb.
> 
> It does not apply to my (2.6.8.1) kernel. But since it works when

No big surprise as it is for 2.6.9-rc2, as name says...  You can pick up
older versions if you want...

> However, I still get a minor problem with the driver.
> When I switch between the default 640x480-60 mode and 1024x768-85 mode
> the 1024x768 gets interlaced, with completely different timings. I have
> to use fbset to restore it to 1024x768-85.

It will work with patch above.
                                                            Petr
                                                            



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