It seems working, but there is something strange:
root@si14-laptop:~# cat /etc/default/grub | grep semaph
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.semaphores=1"
root@si14-laptop:~# cat /sys/module/i915/parameters/semaphores
0
And this is so after reboot.
It seems working, but there is something strange: LINUX_DEFAULT= "quiet splash i915.semaphores=1" i915/parameters /semaphores
root@si14-laptop:~# cat /etc/default/grub | grep semaph
GRUB_CMDLINE_
root@si14-laptop:~# cat /sys/module/
0
And this is so after reboot.