Hello Philip,
probably your case is more an example for the problem described in bugs
#770130 and #776911.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770130
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776911
When you rebuilt your mesa packages did you apply the patch mentioned in
message 15? And was package llvm-3.4-dev installed? If not, I would
assume that your rebuilt packages are also using llvm-3.5.
I have only tested both patches (message 15 and message 32) if they help
with the error "LLVM ERROR: Do not know how to split the result of this
operator!" inside a qemu VM.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=775235#15
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=775235#32
If they could help with the "underrun" error on real hardware, as in
your case, I cannot say.
Kind regards,
Bernhard
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