Comment 24 for bug 1434581

Vesafb was a module in the 3.11 and older kernels. It is now built into the kernel, which is why that file does not exist.

There some vesa specific SAUCE patches in Ubuntu that are not upstream, so that may be why the upstream kernels don't work.

We could bisect between the Ubuntu kernels instead of the mainline kernel. We would first need to identify the last Ubuntu kernel that did not have the bug and the first that did. Can you test the following two kernels:

3.11.0-12.19: https://launchpad.net/ubuntu/+source/linux/3.11.0-12.19/+build/5088396
3.13.0-1.16: https://launchpad.net/ubuntu/+source/linux/3.13.0-1.16/+build/5421709

The 3.11.0-12.19 is that last 3.11 based kernel Trusty used before moving to the 3.12 kernel. The 3.13.0-1.16 kernel is the first 3.13 based kernel that Trusty used.

All of the Trust kernels can be found at:
https://launchpad.net/ubuntu/trusty/+source/linux