Re: [9front] trident cyber 9525 graphics glitches

[lyndsay <lyndsay@vivaldi.net>]

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ok, sounds doable... i'll do some work on that tomorrow. i'm pretty sure=20
it would have been using vesa (1.0?) on windows xp, which was installed=20
on it before i demolished it to make room for plan 9, so i think there=20
*is* a way to get it working. apparently the source code for xp is out=20
there, so if linux fails me, there's that too!

i just modified /lib/vgadb, yep. i attached the patch and i did also try=20
to submit a pull request to the main repository but i have no idea if it=20
went through and my git on this pc is broken and has outdated=20
credentials anyway, so it might be better if someone who knows what=20
they're doing just commits it instead =F0=9F=98=85

- lyndsay

On 9/5/21 6:08 PM, qwx wrote:
>> oh my god, i can't believe i didn't think of simply trying a lower
>> resolution. i'm an idiot sometimes. the graphics DO in fact work fine,
>> and it accepts 24-bit color, using a 640x480 resolution! i would
>> definitely be interested in trying to debug and fix the issue at the
>> source if you/others on the list are interested in helping with that,
>> but i know that's a tall task and probably not a priority for most
>> people, so just downscaling looks like it will work as a quick
>> superficial fix.
> I doubt it occurred to me immediately either :)  Do compare drawing
> performance between 16 and 24bit mode, one may be significantly faster
> than the other for you.  Debugging over the ml is very slow, but I
> would suggest comparing with linux or some other os to check if vesa
> works there and if the drivers behave the same way, and if they don't,
> 1) tracing where vesa fails, and/or 2) tracing where the memory issue
> comes from in the cyber938x.c drivers (/sys/src/9/pc/vgacyber938x.c
> functions in cyber938xdev struct and
> /sys/src/cmd/aux/vga/vgacyber938x.c) and reading the linux or w/e
> driver...  Others may make smarter suggestions.
>
> Please send a patch for whatever you modified (just /lib/vgadb?) :)
>
> Cheers,
>
> qwx

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294a295
> 	0xC70C5="TVGA BIOS KTT 6.0"             # Cyber 9525 / Satellite 2250CDT


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