---
id: pr-vllm-38922
repo: vllm-project/vllm
pr: 38922
title: '[Bugfix] Fix broken explicit unquantized kv cache dtype support'
author: Isotr0py
date: '2026-04-10'
url: https://github.com/vllm-project/vllm/pull/38922
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- fp8
- quantization
techniques: []
hardware_features:
- fp8
kernel_types:
- attention
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-17'
status: merged
merge_sha: 58c0a928c99c80ad3c8f16266a2344c98cf05c24
inclusion_reason: kernel file changes
changed_paths:
- csrc/attention/dtype_fp8.cuh
- csrc/quantization/w8a8/fp8/amd/quant_utils.cuh
- csrc/quantization/w8a8/fp8/nvidia/quant_utils.cuh
head_ref_oid: c8c22d2b9429514b5808dbc9950f8e44740c2547
artifact_dir: evidence/pull-bundles/vllm/gh-38922
---
# [Bugfix] Fix broken explicit unquantized kv cache dtype support

- Repository: `vllm-project/vllm`
- PR: [38922](https://github.com/vllm-project/vllm/pull/38922)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/attention/dtype_fp8.cuh`
- `csrc/quantization/w8a8/fp8/amd/quant_utils.cuh`
- `csrc/quantization/w8a8/fp8/nvidia/quant_utils.cuh`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-38922`
