Created attachment 121933 [details] apitrace Without explicit layout(location = x) qualifier, the v_id seems to get values from v_pos.
That bugs been fixed in 11.2 the v_pos in the frag shader is unused and will get dead code eliminated in 11.1.2. In 11.2 we don't remove unused varyings that don't have explicit locations with SSO. *** This bug has been marked as a duplicate of bug 79783 ***
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