Re: Framebuffer console not working with matroxfb on 2.6

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

[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: Re: Framebuffer console not working with matroxfb on 2.6

[Geert Uytterhoeven]

On Fri, 17 Sep 2004, Michal 'hramrach' Suchanek wrote:
> 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.

I think this is a `feature' of the new mode selection code. When I tried
booting my Radeon with `1024x768@100', I got 87 Hz interlaced...

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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Re: Re: Framebuffer console not working with matroxfb on 2.6

[Antonino A. Daplas]

On Friday 17 September 2004 17:53, Geert Uytterhoeven wrote:
> On Fri, 17 Sep 2004, Michal 'hramrach' Suchanek wrote:
> > 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.
>
> I think this is a `feature' of the new mode selection code. When I tried
> booting my Radeon with `1024x768@100', I got 87 Hz interlaced...
>

Michal's problem is more of a failure to preserve the per-display var, which
should be fixed with recent mm or rc kernels.

Yours is more of boot mode selection problem and most drivers use
fb_find_mode() for that.  The default modedb does not have 1024x768@100
non-interlaced, so it passed the interlaced version to the driver, which it
happily accepted.  Thus, you get the interlaced version.

Tony




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Re: Re: Framebuffer console not working with matroxfb on 2.6

[Geert Uytterhoeven]

On Fri, 17 Sep 2004, Antonino A. Daplas wrote:
> On Friday 17 September 2004 17:53, Geert Uytterhoeven wrote:
> > On Fri, 17 Sep 2004, Michal 'hramrach' Suchanek wrote:
> > > 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.
> >
> > I think this is a `feature' of the new mode selection code. When I tried
> > booting my Radeon with `1024x768@100', I got 87 Hz interlaced...
>
> Michal's problem is more of a failure to preserve the per-display var, which
> should be fixed with recent mm or rc kernels.
>
> Yours is more of boot mode selection problem and most drivers use
> fb_find_mode() for that.  The default modedb does not have 1024x768@100
> non-interlaced, so it passed the interlaced version to the driver, which it
> happily accepted.  Thus, you get the interlaced version.

Modedb does have that mode! Before I've been using it for years on my PPC box.

linux-2.6.8.1/drivers/video/modedb.c:

    }, {
        /* 1024x768 @ 100Hz, 80.21 kHz hsync */
        NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10,
        0, FB_VMODE_NONINTERLACED
    }, {

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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Re: Re: Framebuffer console not working with matroxfb on 2.6

[Antonino A. Daplas]

On Friday 17 September 2004 19:50, Geert Uytterhoeven wrote:

> Modedb does have that mode! Before I've been using it for years on my PPC
> box.
>
> linux-2.6.8.1/drivers/video/modedb.c:
>
>     }, {
>         /* 1024x768 @ 100Hz, 80.21 kHz hsync */
>         NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10,
>         0, FB_VMODE_NONINTERLACED
>     }, {
>
> Gr{oetje,eeting}s,

Indeed it does.  So why didn't radeonfb not use the mode?  Is it a problem
with fb_find_mode() or radeonfb?

Tony




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Re: Re: Framebuffer console not working with matroxfb on 2.6

[Benjamin Herrenschmidt]

> Indeed it does.  So why didn't radeonfb not use the mode?  Is it a problem
> with fb_find_mode() or radeonfb?

I suspect my radeonfb is bad at using mode paremeters to the module,
does it work with fbdev afterward ?

I need to work on it, I did a pretty good job with digital panels but
I think I may have broken a few stuffs useful with analog, like boot mode
setting...

Ben.




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Re: Re: Framebuffer console not working with matroxfb on 2.6

[Antonino A. Daplas]

On Friday 17 September 2004 16:51, 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.g
> >z, 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.
>

This problem should be fixed in kernels >= 2.6.9-rc1.

Tony




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