I confirm that the problem persists with kernel 5.2.9 on HP Spectre x360.
I am using kernel 5.1.9, which has no problem.
In addition, kernel 5.1.9 with linux-firmware-20190815.07b925b-1 has a problem with iwlwifi, so I had also to downgrade it to linux-firmware-20190618.acb56f2-1
I confirm that the problem persists with kernel 5.2.9 on HP Spectre x360.
I am using kernel 5.1.9, which has no problem.
In addition, kernel 5.1.9 with linux-firmware- 20190815. 07b925b- 1 has a problem with iwlwifi, so I had also to downgrade it to linux-firmware- 20190618. acb56f2- 1