[Bug 39282] radeon HD6790 (barts) card produces black+white horizontal stripes on screen when launching Xorg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39282

--- Comment #38 from Alex Deucher <agd5f at yahoo.com> 2011-12-12 09:05:41 PST ---
(In reply to comment #37)
> If I look at the patched file evergreen.c, I see that the specs do not match
> yet. For example, the number of SIMDS is defined as 5 in the source, but the
> references tell me that the BARTS LE has 10.
> 

5 SIMDs per SE (Shader Engine) and it has 2 SEs for a total of 10 SIMDs.

> Additionally, I tried 3.2-rc5 today, showing the same does-not-boot behavior as
> before. However, setting num_ses to "1" makes sense in terms of calculating
> max_backends as num_ses * 2, as the BARTS LE has only 2 backends available.
> Unfortunately, it doesn't work here with a setting of "1" for num_ses.
> 
> I can't assign the other variables in the source code, as I have no idea what
> "max_pipe", "max_tile_pipes" and other statements such as the famous
> "backend_map" mean...
> 

max_pipes is the number of quad pipes and backend map associates quad pipes
with render backends.

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