I have now followed the same steps for the kernel linked to below and already
see flickering.
https://bugzilla.freedesktop.org/show_bug.cgi?id=110511#c25
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I followed these steps and the screen still flickers.
1) Downloaded the kernel linked to here into a new directory:
https://bugzilla.freedesktop.org/show_bug.cgi?id=110511#c16
2) sudo dpkg -i *deb
3) sudo reboot
Have I correctly installed the new kernel?
$ uname -a
Linux XPS-13-9380