Oh, fragment-shaders themselves work just fine with the intel-driver.
I've used them on i915 and similar hardware successfully in the past.
The major shortcoming are the number of independent texture-lookups
(restricts the radius of the blur-kernel) and framebuffer-object support
(important for efficient 2-pass convolution fiters, which are
separable... like the gaussian blur). If you want to track these GL-
features in the intel-driver on you intel-GPU of choice, get into the
habbit to live on the bleeding edge of Mesa/DRI and the xf86-video-intel
driver from xorg. That is very time-consuming... especially if you don't
have that kickstarted yet.

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no blurring is present
https://bugs.launchpad.net/bugs/344896
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