Comment # 13
on bug 45641
from Alex Deucher
(In reply to comment #12) > Interesting: If I connect only one monitor (either on cable 1 or 2), it > works well. The blinking is caused by data underflow to the display controllers. All clients on the GPU (displays, 3D engine, etc.) contend for memory bandwidth. If you have a card with limited memory bandwidth (like yours), you may get underflow if there is not enough bandwidth to service the displays at a particular moment in time. Running several large monitors increases the memory bandwidth requirements. The display watermarks may need some fine tuning for situations like yours. Additional things to try: 1. try a lower refresh rate 2. Disable acceleration (Option "NoAccel" "True" in the device section of your xorg.conf) 3. Disable Tiling (Option "ColorTiling" "False" in the device section of your xorg.conf) 4. Try mesa 9.1 or newer.
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