For the record, this still happens with the latest -intel/UXA/KMS versions.
However, it does _not_ happen any more on my system since I plugged in a second GB of RAM. Now it has two RAM pipelines available which apparently makes memory operations fast enough to avoid the underruns. I discussed this with Jesse Barnes at UDS, and he seems to understand the root cause of this now.
For the record, this still happens with the latest -intel/UXA/KMS versions.
However, it does _not_ happen any more on my system since I plugged in a second GB of RAM. Now it has two RAM pipelines available which apparently makes memory operations fast enough to avoid the underruns. I discussed this with Jesse Barnes at UDS, and he seems to understand the root cause of this now.
I'll continue discussion upstream.