Comment 0 for bug 1055231

I have the high-end Dell XPS 13, running the latest kamal8 kernel.

To reproduce:

1) Boot/reboot XPS.
2) Adjust screen brightness via Fn+F4/Fn+F4. Note that that the brightness adjustment notifications work fine, and the brightness changes as expected.
3) Suspend machine (e.g. close the lid).
4) Wake machine up.
5) Try adjusting screen brightness again as in (2). Note that the brightness adjustment notifications again work fine, but the brightness does NOT change at all.

Note that this bug was not present in the kamal6 kernel; I would say this is a regression.