From ce373c0b4d6e9fb3a4293f5d6d78596841fac323 Mon Sep 17 00:00:00 2001
From: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Date: Thu, 19 Mar 2026 08:40:18 -0400
Subject: [PATCH] Fix V100 CUDA compatibility for demeter4 runners

Add LocalPreferences.toml to pin CUDA runtime 12.6 and disable
forward-compat driver. V100 GPUs (compute capability 7.0) require
system driver since CUDA_Driver_jll v13+ drops cc7.0 support.

Ref: ChrisRackauckas/InternalJunk#19
---
 test/gpu/LocalPreferences.toml | 7 +++++++
 test/gpu/Project.toml          | 4 +++-
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 test/gpu/LocalPreferences.toml

diff --git a/test/gpu/LocalPreferences.toml b/test/gpu/LocalPreferences.toml
new file mode 100644
index 00000000..b65c691f
--- /dev/null
+++ b/test/gpu/LocalPreferences.toml
@@ -0,0 +1,7 @@
+[CUDA_Runtime_jll]
+version = "12.6"
+
+[CUDA_Driver_jll]
+# Disable forward-compat driver — V100 runners need the system driver
+# since CUDA_Driver_jll v13+ drops compute capability 7.0 support
+compat = "false"
diff --git a/test/gpu/Project.toml b/test/gpu/Project.toml
index 18ce094b..608a8dca 100644
--- a/test/gpu/Project.toml
+++ b/test/gpu/Project.toml
@@ -1,5 +1,7 @@
 [deps]
 CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
+CUDA_Driver_jll = "4ee394cb-3365-5eb0-8335-949819d2adfc"
+CUDA_Runtime_jll = "76a88914-d11a-5bdc-97e0-2f5a05c973a2"
 
 [compat]
-CUDA = "3.12, 4, 5"
+CUDA = "4, 5"