[Intel-gfx] [PATCH] Check for a min level when computing the watermark.

[Thomas Richter]

Dear intel experts,

the attached patch is a minimally invasive modification of the watermark 
computation for the 830GM chipset graphics. It adds a minimum watermark 
level to test against. The minimum value is zero for all other families 
of the intel chipset graphics, thus causing no change there.

What is still strange is that the default watermark level is only used 
if the watermark level computation returns a value below zero, though 
values *below* the default value are acceptable as long as the are above 
or equal to zero. Anyhow, I keep it like this for the time being to 
avoid breaking anything.

Greetings,
	Thomas

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