Re: Issue with i915 PSR module option

[Reco <recoverym4n@enotuniq.net>]

	Hi.

On Sat, Mar 28, 2020 at 05:43:01PM +0100, l0f4r0@tuta.io wrote:
> Hi,
> 
> I'm on Buster.
> Could somebody explain me please why my i915 PSR option doesn't seem to be taken into account after reboot (still -1 instead of 0):
> 
> $ sudo modinfo i915 | grep -i psr
> parm:           enable_psr:Enable PSR (0=disabled, 1=enabled) Default: -1 (use per-chip default) (int)
> 
> $ ls -l /etc/modprobe.d/i915.conf
> -rw-r--r-- 1 root root 26 mars  28 17:09 /etc/modprobe.d/i915.conf
> 
> $ sudo cat /etc/modprobe.d/i915.conf
> options i915 enable_psr=0
> 
> $ sudo cat /sys/module/i915/parameters/enable_psr
> -1

Probably because your /etc/modprobe.d/i915.conf did not get included in
initrd. "i915" usually gets loaded before root filesystem is loaded, so
your file does not get any effect.
Execute "update-initramfs -k all -u", check the presence of i915.conf in
initrd (lsinitrams), reboot and check it one more time.

Reco