2.6.9 bug: linux logo not displayed in vga16fb

2.6.9 bug: linux logo not displayed in vga16fb

[Ludovic Drolez]

Hi !

I used to have a nice vga boot logo with my 2.6.7 kernel, but with the 2.6.9, my
boot logo has disappeared (same .config)...
It seems to switch to VGA, and some space is reserved for the logo, but it is 
not displayed.
The logo appears with vesafb.


Any idea / patch welcome !

Cheers,

   Ludo

-- 
Ludovic DROLEZ                              Linbox / Free&ALter Soft
152 rue de Grigy - Technopole Metz 2000                   57070 METZ
tel : 03 87 50 87 90                            fax : 03 87 75 19 26

Re: 2.6.9 bug: linux logo not displayed in vga16fb (bug found)

[Ludovic Drolez]

Ludovic Drolez wrote:
> Hi !
> 
> I used to have a nice vga boot logo with my 2.6.7 kernel, but with the 
> 2.6.9, my
> boot logo has disappeared (same .config)...
> It seems to switch to VGA, and some space is reserved for the logo, but 
> it is not displayed.
> The logo appears with vesafb.

I made a few diffs between my old working 2.6.7 kernel and the 2.6.9 and found 
something interesting in fbmem.c:

---------------
@@ -723,7 +419,7 @@
         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
                 return 0;

-       image.depth = fb_logo.depth;
+       image.depth = 8;
         image.data = fb_logo.logo->data;

         if (fb_logo.needs_cmapreset)
---------------

So, on my 2.6.9, I replaced the '8' by 'fb_logo.depth' and now the logo is 
shown! (but the screen is still not cleared as before when the kernel boots).

Where's the QA guy ? I want to see him now ! ;-)

Cheers,

-- 
Ludovic DROLEZ                              Linbox / Free&ALter Soft
152 rue de Grigy - Technopole Metz 2000                   57070 METZ
tel : 03 87 50 87 90                            fax : 03 87 75 19 26
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Re: 2.6.9 bug: linux logo not displayed in vga16fb (bug found)

[Ludovic Drolez]

Ludovic Drolez wrote:
> Hi !
> 
> I used to have a nice vga boot logo with my 2.6.7 kernel, but with the 
> 2.6.9, my
> boot logo has disappeared (same .config)...
> It seems to switch to VGA, and some space is reserved for the logo, but 
> it is not displayed.
> The logo appears with vesafb.

I made a few diffs between my old working 2.6.7 kernel and the 2.6.9 and found 
something interesting in fbmem.c:

---------------
@@ -723,7 +419,7 @@
         if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
                 return 0;

-       image.depth = fb_logo.depth;
+       image.depth = 8;
         image.data = fb_logo.logo->data;

         if (fb_logo.needs_cmapreset)
---------------

So, on my 2.6.9, I replaced the '8' by 'fb_logo.depth' and now the logo is 
shown! (but the screen is still not cleared as before when the kernel boots).

Where's the QA guy ? I want to see him now ! ;-)

Cheers,

-- 
Ludovic DROLEZ                              Linbox / Free&ALter Soft
152 rue de Grigy - Technopole Metz 2000                   57070 METZ
tel : 03 87 50 87 90                            fax : 03 87 75 19 26

Re: [Linux-fbdev-devel] Re: 2.6.9 bug: linux logo not displayed in vga16fb (bug found)

[Antonino A. Daplas]

On Tuesday 26 October 2004 23:54, Ludovic Drolez wrote:
> Ludovic Drolez wrote:
> > Hi !
> >
> > I used to have a nice vga boot logo with my 2.6.7 kernel, but with the
> > 2.6.9, my
> > boot logo has disappeared (same .config)...
> > It seems to switch to VGA, and some space is reserved for the logo, but
> > it is not displayed.
> > The logo appears with vesafb.
>
> I made a few diffs between my old working 2.6.7 kernel and the 2.6.9 and
> found something interesting in fbmem.c:
>

Should be fixed in the mm tree or the latest bk snapshot. Or you can try this
very patch.

Tony

diff -uprN linux-2.6.9-rc1-mm4-orig/drivers/video/vga16fb.c linux-2.6.9-rc1-mm4/drivers/video/vga16fb.c
--- linux-2.6.9-rc1-mm4-orig/drivers/video/vga16fb.c	2004-09-07 21:18:35.000000000 +0800
+++ linux-2.6.9-rc1-mm4/drivers/video/vga16fb.c	2004-09-07 21:30:39.059300648 +0800
@@ -1306,7 +1306,7 @@ void vga16fb_imageblit(struct fb_info *i
 {
 	if (image->depth == 1)
 		vga_imageblit_expand(info, image);
-	else if (image->depth <= info->var.bits_per_pixel)
+	else
 		vga_imageblit_color(info, image);
 }