@anarch My notebook is a Dell XPS 13 (model 9343, 2015): https://wiki.archlinux.org/index.php/Dell_XPS_13_(2015) . It has a Realtek ALC3263 chipset which is “dual-mode”, i.e., it supports both the HDA standard and the I2S standard. The the OS determines which mode the sound chipset initializes in at boot. Since kernel 4.4, Arch and Fedora chose to initialize I2S. Then my audio problems started. At the time, I was running Fedora and reported the bug. Sound worked for a while and then crashed. The same thing happened with Antergos. Kernel 4.5.2 was supposed to fix the problem, but my crashes persisted. A few other users reported similar crashes. I finally discoved tha the problem is caused by gdm. See https://bugs.archlinux.org/task/48936 . Somehow, gdm, through pulseaudio (I believe), causes the problem. Note that other users reported similar crashes. So far, I have been compiling my kernels using the option CONFIG_ACPI_REV_OVERRIDE_POSSIBLE=y in order not to use I2S audio.
To make a long story short, gdm is causing crashes on my computer. I run Gnome 3.20 and then tried to replace gdm with lightdm. I then faced two problems: I was unable to lock the screen (which I reported here) and the screensaver no longer worked. If I can get lightdm to work properly, I will then be able to finally have I2S audio and I will no longer need to compile my kernels.
That’s why I am asking for help.