I've always had difficulties booting the default kernel of 3.1 (4.1.24.10), 
graphic corruption making it impossible to complete a boot. As such I've just 
always used 3.18.17-8 which behaves fine on my hardware.

Am now preparing to make the upgrade to 3.2, but want to ensure if at all 
possible there is a kernel that will boot before I do. Is it possible / logical 
to test the same kernel version that will be available / default with 3.2 on 
3.1 or is it much more a suck-it-and-see if it sucks sort of situation?

Had some time to get back to looking at this. The issue is the same with any of 
the 4.x kernels in 3.1's unstable repo. Having tried various i915 kernel 
parameters without luck the only one that has an effect is plain old 
"nomodeset", which initially goes okay but then won't get as far as the login 
screen "failed to start graphics turbo". I don't think the driver actually 
works without kernel mode setting?

Having read around a bit, I'm wondering if this is a consequence of the driver 
switching to SNA rather than UXA in Kernels 4 and up, however I don't see any 
way to set this as a kernel parameter, only in an X config file, but the issue 
here is not being able to get as far as the login screen.

The only other thing that occurs, is that perhaps the 4 kernel will behave 
better with 3.2 having a more recent version of xorg-x11-drv-intel than 3.1 - 
I've really no idea how this package and the driver in the kernel interact...

I'm going to have to just perform my backup and try the upgrade to 3.2, but not 
exactly enthused as to chances of success....

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