vga16fb diagnostics
Carey O'Shea
carey at internode.on.net
Fri Sep 30 22:23:34 CDT 2005
Matthew Garrett wrote:
>Hello,
>
>I'm trying to track down why vga16fb doesn't work on some machines. In
>an attempt to check one thing that may be causing problems, I've written
>a small program that dumps state about some vga registers. I'm
>interested in knowing how the values differ between vga16fb and vesafb.
>If you're having problems with vga16fb, get it from
>
>http://www.codon.org.uk/~mjg59/tmp/crtc
>
>and do the following:
>
>1) Boot into rescue mode. Ensure that no framebuffer is loaded. modprobe
>vga16fb and then do crtc >vgaregs (you may have to do this blind)
>
>2) Boot into rescue mode with the kernel parameter vga=769 and do crtc
>
>
>>vesaregs
>>
>>
>
>3) Mail the two of them to me
>
>Please don't do this if vga16fb works for you.
>
>
Hi Matthew et al,
I did the tests, maybe someone on ubuntu-devel will be able to find out
what is causing my problems.
carey at sanctuary:~$ cat vgaregs
0 is 5f
1 is 4f
2 is 4f
3 is 82
4 is 52
5 is 9e
6 is b
7 is 3e
8 is 0
9 is 40
a is 20
b is 0
c is 0
d is 0
e is 0
f is 0
10 is e9
11 is b
12 is df
13 is 28
14 is 1f
15 is df
16 is b
17 is e3
18 is ff
carey at sanctuary:~$ cat vesaregs
0 is 6d
1 is 4f
2 is 4f
3 is 11
4 is 59
5 is 87
6 is ea
7 is 1f
8 is 0
9 is 40
a is 0
b is 0
c is 0
d is 0
e is 6
f is 66
10 is e3
11 is 86
12 is df
13 is 50
14 is 40
15 is df
16 is eb
17 is a3
18 is ff
carey at sanctuary:~$
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