FWIW, I confirmed the same with 511.65 and your reproducer. The internal driver version I tested working is numbered 515 . This doesn’t rule out a fix in a 511 driver, but since I couldn’t find the actual bug report, it might indeed not get merged into the 510 branch. If the fix is only in 515, it will be a couple of months. I’ll double check if someone on the team can try to track down the fix and merge it earlier.
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David.