Comment 51 for bug 541511

Created an attachment (id=34505)
memory check patch for legolas

legolas, please apply this patch on top of v6. When a flush fails, this will read back the check values written to system mem (cpu) and gtt via the same path as they have been written to and print them out. If the readback value equals the expected value (look at the chipset fail message right before), everything is fine. If they equal the values as read on the other side (i.e. gtt readback = cpu read), something is corrupting memory when (ab)using the gtt.

To test just stress your system until you get a cache flush failure.