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[tomm3h <749347@xxxxxxxxxxxxxxxxxx>]

Can confirm I have the same (or similar) issue, but this is limited to
my 2nd VGA head only. The 1st is fine, no flickering.

Installation is a recent upgrade from 10.10 x86_64 (fully updated, no
third-party repos) to 11.04.

GPU hardware is a Radeon HD3450, *no fglrx*, the rest of the chipset/CPU
are all Intel-based.

The flicker isn't related to activity and occurs every 20-30 seconds,
with both the 2.6.38-7-generic kernel from the natty repository and
2.6.39-rc1 from the kernel PPA.

Similarly both Unity and 'Ubuntu classic' interfaces are affected.

I have also upgraded mesa/xorg/drivers with the xorg-edgers repository,
to no avail.

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https://bugs.launchpad.net/bugs/749347

Title:
  flicker on screen