Comment # 2
on bug 105095
from Roland Scheidegger
FWIW this looks very similar to a bug recently fixed for radv. Probably not so coincidentally, radeonsi has workarounds for 2/10/10/10 signed formats, apparently gcn hw before vega (with the exception of stoney ridge) has a bug interpreting the 2bit alpha as unsigned. The output from this test would be consistent with that (alpha 1.0 as 2 bit snorm would be 0x01, whereas that value interpreted as unorm would be 0.333). So maybe the same bug could affect later evergreen hw as well.
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