Workaround Mesa 20 Intel driver bug with GLX_OML_sync_control

Disable the use of this extension on Mesa 20/intel, it's causing GPU hangs. Bug: chromium:1187475 Change-Id: Ic7029b1f72bd0b0f4a2c11a7fceb0a59f51be8aa Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2920811Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>

Workaround Mesa 20 Intel driver bug with GLX_OML_sync_control
fe93fcdd · Jonah Ryan-Davis · Angle LUCI CQ · 96ab6566 · fe93fcdd
Commit fe93fcdd authored May 27, 2021 by Jonah Ryan-Davis Committed by Angle LUCI CQ May 31, 2021
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renderergl_utils.cpp src/libANGLE/renderer/gl/renderergl_utils.cpp +5 -2

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--- a/src/libANGLE/renderer/gl/renderergl_utils.cpp
+++ b/src/libANGLE/renderer/gl/renderergl_utils.cpp
@@ -2099,8 +2099,11 @@ void InitializeFeatures(const FunctionsGL *functions, angle::FeaturesGL *feature
    ANGLE_FEATURE_CONDITION(features, bindTransformFeedbackBufferBeforeBindBufferRange, IsApple());
    // http://crbug.com/1137851
-    // Speculative fix for now, leave disabled so users can enable it via flags.
+    // Speculative fix for above issue, users can enable it via flags.
-    ANGLE_FEATURE_CONDITION(features, disableSyncControlSupport, false);
+    // http://crbug.com/1187475
+    // Disable on Mesa 20 / Intel
+    ANGLE_FEATURE_CONDITION(features, disableSyncControlSupport,
+                            IsLinux() && isIntel && isMesa && mesaVersion[0] == 20);
    ANGLE_FEATURE_CONDITION(features, keepBufferShadowCopy, !CanMapBufferForRead(functions));