Flickering on external monitor

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http://crunchbanglinux.org – #! 32-bit r201102 updated running on an Acer Aspire 4710 with Intel Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller. Attached a 20" external monitor to the VGA and booted up. Uses grandr to disable laptop panel and enable external screen on Auto settings (1600x900 at 60Hz). The screen is now showing an occassional, but very distracting, flicker. Any ideas? Is it related to this which corenominal linked to in a related post from a few years ago and is now outdated? I think I'm using the i915 driver.$ lsmod | grep 915 i915 309940 2 drm_kms_hel (HowTos)