Comment 3 for bug 1861380

Hi,

since it now appears that Focal will have 5.4 kernel (1), I tested integrating the upstream kernel patches (2) related to this issue in current Focal kernel master and master-next branches (3). Patches applied smoothly to both branches and with both kernels the display backlight works correctly in my test devices (Intel Apollolake based tablets).

BR,
Mikko Kovanen

1) https://lists.ubuntu.com/archives/kernel-team/2020-February/107227.html
2) https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=8cbf89db294166cc13d90a89422605e0c9f8bbc2
   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=6f4261fa86dfe08c34ad99eba66368f43e9dd4c3
   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=1788fdf14e518e363bae9d18345d93102f4ee5ad
3) https://kernel.ubuntu.com/git/ubuntu/ubuntu-focal.git/