[PATCH] Updating Documentation/fb/vesafb.txt

[PATCH] Updating Documentation/fb/vesafb.txt

[Christian Heim]

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Hello Antonino,

I recently tried to figure how to get my vesafb to 1600x1200 and updated the 
vesafb.txt documentation accordingly. I'm still not sure about the video mode 
for 256, since it doesn't seem to follow the algorithm the other vga-modes 
seem to follow.

Example:
    | 640x480  800x600  1024x768 1280x1024
----+-------------------------------------
256 |  0x301    0x303    0x305    0x307     | +0x002
32k |  0x310    0x313    0x316    0x319
      -------  -------  -------  -------
      +0x009    +0x010   +0x011   +0x012

So accordingly to that algorithm, the mode for 1600x1200@256 should either be 
0x309 or 0x360 which both don't work.

Find attached the mentioned patch to update vesafb.txt.

Please CC me on replies, since I'm not subscribed to the list.

-- 
Christian Heim <phreak at gentoo.org>
GPG: 9A9F68E6 / AEC4 87B8 32B8 4922 B3A9  DF79 CAE3 556F 9A9F 68E6

Your friendly mobile/kernel/vserver/openvz monkey

Signed-off-by: Christian Heim <phreak@gentoo.org>
--

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diff --git a/Documentation/fb/vesafb.txt b/Documentation/fb/vesafb.txt
index ee277dd..9565543 100644
--- a/Documentation/fb/vesafb.txt
+++ b/Documentation/fb/vesafb.txt
@@ -40,12 +40,12 @@ The graphic modes are NOT in the list wh
 vga=ask and hit return. The mode you wish to use is derived from the
 VESA mode number. Here are those VESA mode numbers:
 
-    | 640x480  800x600  1024x768 1280x1024
-----+-------------------------------------
-256 |  0x101    0x103    0x105    0x107   
-32k |  0x110    0x113    0x116    0x119   
-64k |  0x111    0x114    0x117    0x11A   
-16M |  0x112    0x115    0x118    0x11B   
+    | 640x480  800x600  1024x768 1280x1024 1600x1200
+----+-----------------------------------------------
+256 |  0x101    0x103    0x105    0x107     0x???   
+32k |  0x110    0x113    0x116    0x119     0x173   
+64k |  0x111    0x114    0x117    0x11A     0x174   
+16M |  0x112    0x115    0x118    0x11B     0x175   
 
 The video mode number of the Linux kernel is the VESA mode number plus
 0x200.
@@ -54,12 +54,12 @@ The video mode number of the Linux kerne
 
 So the table for the Kernel mode numbers are:
 
-    | 640x480  800x600  1024x768 1280x1024
-----+-------------------------------------
-256 |  0x301    0x303    0x305    0x307   
-32k |  0x310    0x313    0x316    0x319   
-64k |  0x311    0x314    0x317    0x31A   
-16M |  0x312    0x315    0x318    0x31B   
+    | 640x480  800x600  1024x768 1280x1024 1600x1200
+----+-----------------------------------------------
+256 |  0x301    0x303    0x305    0x307     0x???   
+32k |  0x310    0x313    0x316    0x319     0x373   
+64k |  0x311    0x314    0x317    0x31A     0x374   
+16M |  0x312    0x315    0x318    0x31B     0x375   
 
 To enable one of those modes you have to specify "vga=ask" in the
 lilo.conf file and rerun LILO. Then you can type in the desired

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Re: [PATCH] Updating Documentation/fb/vesafb.txt

[Antonino A. Daplas]

Christian Heim wrote:
> Hello Antonino,
> 
> +    | 640x480  800x600  1024x768 1280x1024 1600x1200
> +----+-----------------------------------------------
> +256 |  0x301    0x303    0x305    0x307     0x???   
> +32k |  0x310    0x313    0x316    0x319     0x373   
> +64k |  0x311    0x314    0x317    0x31A     0x374   
> +16M |  0x312    0x315    0x318    0x31B     0x375   
>  
>  To enable one of those modes you have to specify "vga=ask" in the
>  lilo.conf file and rerun LILO. Then you can type in the desired

This is not correct. VESA did not define 1600x1200 as part of
its DVT standard. And starting with VBE 2.0, VESA is not going to
define new mode ID's. Thus the mode ID that you get for 1600x1200 may
be unique only for your particular hardware/Video BIOS.

You may use X's 'vesa' driver to get a list of modes that your
BIOS supports. It will be written to /var/log/X*.0.log.

Tony

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