Mika Rastas wrote:
> So about 5 boots later I'am firmly confident that the problem shows 
> itself only on kernel 2.6.20. On this computer I have compiled my kernel from 
> debian 
> sources with the vesa-tng patch. On the other computer the kernel is the 
> official debian kernel 2.6.20-1-k7. On 2.6.18 self compiled it's all 
> good.
>   

Do you see the problem with any kernel *without* this patch?

What's your kernel command line? Does the problem go away if you remove
all parameters on the command line?
If framebuffer console is enabled, could you try without it?

The problem could be related to a conflict between X and the framebuffer
console.

> Also The black rectangles are only shown when in X. Not when I'am in a 
> console with framebuffer.
>
> Might the kernel be the source of the bug after all? Or is the kernel 
> doing something different and xorg is not upto it yet?
>   

The kernel has to initialize some stuff and provide some mappings for X.
However, I would expect big X breakage in case of a bug in the kernel,
not such a "tiny" rendering artefact.

If the bug occurs with 2.6.20 and 2.6.21 but not in 2.6.18, it would be
very good to locate where it exactly appeared. I mean, try with 2.6.19,
and then try 2.6.18-rcX or 2.6.19-rcY, and then find the exactly git commit.

Brice



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