2002-07-27 19:53:47

by Peter T. Breuer

Subject: [PATCH] turn vesa framebuffer off at boot 2.4.18

I use the same kernel everywhere but when vesa framebuffer is compiled
into the kernel the text mode console on my laptop doesn't show the
bottom few lines of the screen.

So I wanted to turn it off at boot .. but there didn't seem to be a way
:-(. Hence I added the boot param

video=vesa:off

Apologies if it was possible some other way. I believe I've heard
of some distros providing FB and NONFB kernels. I didn't stop to
investigate beyond reading the Documentation/fb/*.txt.

This patch is against the pre-2.4.18 kernel code I had handy.
Sorry if it needs to be more recent. I don't have another 120M
to spare for a newer source just now ...

It works.


--- vesafb.c.orig Sat Jul 27 21:42:39 2002
+++ vesafb.c Sat Jul 27 21:10:39 2002
@@ -98,6 +98,7 @@

static int pmi_setpal = 0; /* pmi for palette changes ??? */
static int ypan = 0; /* 0..nothing, 1..ypan, 2..ywrap */
+static int disable = 0; /* added by P. Breuer [email protected] */
static unsigned short *pmi_base = 0;
static void (*pmi_start)(void);
static void (*pmi_pal)(void);
@@ -462,6 +463,8 @@

if (! strcmp(this_opt, "inverse"))
inverse=1;
+ else if (! strcmp(this_opt, "off"))
+ disable=1;
else if (! strcmp(this_opt, "redraw"))
ypan=0;
else if (! strcmp(this_opt, "ypan"))
@@ -504,6 +507,12 @@
int __init vesafb_init(void)
{
int i,j;
+
+ if (disable) {
+ printk(KERN_INFO
+ "vesafb: aborted on user req (disable)\n");
+ return -EINVAL;
+ }

if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
return -ENXIO;

2002-07-27 20:29:33

by Bongani Hlope

Subject: Re: [PATCH] turn vesa framebuffer off at boot 2.4.18

If you areusing lilo the remove the line
vga=788 (NOTE: this number might be different)
or replace it by vga=normal (IIRC)
the other option is to add the vga=normal on the boot param

On Sat, 2002-07-27 at 21:56, Peter T. Breuer wrote:
>
> I use the same kernel everywhere but when vesa framebuffer is compiled
> into the kernel the text mode console on my laptop doesn't show the
> bottom few lines of the screen.
>
> So I wanted to turn it off at boot .. but there didn't seem to be a way
> :-(. Hence I added the boot param
>
> video=vesa:off
>
> Apologies if it was possible some other way. I believe I've heard
> of some distros providing FB and NONFB kernels. I didn't stop to
> investigate beyond reading the Documentation/fb/*.txt.
>
> This patch is against the pre-2.4.18 kernel code I had handy.
> Sorry if it needs to be more recent. I don't have another 120M
> to spare for a newer source just now ...
>
> It works.
>
>
> --- vesafb.c.orig Sat Jul 27 21:42:39 2002
> +++ vesafb.c Sat Jul 27 21:10:39 2002
> @@ -98,6 +98,7 @@
>
> static int pmi_setpal = 0; /* pmi for palette changes ??? */
> static int ypan = 0; /* 0..nothing, 1..ypan, 2..ywrap */
> +static int disable = 0; /* added by P. Breuer [email protected] */
> static unsigned short *pmi_base = 0;
> static void (*pmi_start)(void);
> static void (*pmi_pal)(void);
> @@ -462,6 +463,8 @@
>
> if (! strcmp(this_opt, "inverse"))
> inverse=1;
> + else if (! strcmp(this_opt, "off"))
> + disable=1;
> else if (! strcmp(this_opt, "redraw"))
> ypan=0;
> else if (! strcmp(this_opt, "ypan"))
> @@ -504,6 +507,12 @@
> int __init vesafb_init(void)
> {
> int i,j;
> +
> + if (disable) {
> + printk(KERN_INFO
> + "vesafb: aborted on user req (disable)\n");
> + return -EINVAL;
> + }
>
> if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
> return -ENXIO;
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/