I have a VAIO VPC-SA laptop, with an Ubuntu 11.4 installed. The problem lies in the strange screen blinking/noise which is mostly noticeable in grey gradients and causes eyes fatigue and pain after prolonged use.
This problem does not occur with the VESA driver and Windows, but it's reproduced in Fedora Core and Ubuntu 10.08/11.08 at X-window and cosole (with i915 module). It is clear that the problem is in the driver, but I can't determine the source of noise, it may be because of the backlight, or the display-panel.
I captured it and it looks like this.