Created attachment 131880 [details] Dmesg output Hi. Ever since I upgraded to kernels >4.9, I'm unable to set the i915.semaphores option enabled (=1). Already tried Ubuntu, Debian, Arch and openSUSE and tried setting the option both on /etc/default/grub and /etc/modprobe.d/i915.conf. With kernels prior to 4.9, everything was working fine. uname -rm: 4.11.4 x86_64 cat /proc/cmdline: BOOT_IMAGE=/boot/vmlinuz-4.11.4 root=UUID=16e0a6c5-d60a-483e-a949-0b58aaf42417 ro rhgb quiet i915.semaphores=1 cat /sys/module/i915/parameters/semaphores: 0 Distro: Fedora 25 Workstation Video adapter: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) Dmesg attached.
Hello Gabriel, could you please add the parameter "drm.debug=0xe" in the grub and then get the dmesg again. Also, if possible, could you add the hardware information and a dmesg log with the old kernel where the i915.semaphores is working with the same drm.debug=0xe parameter added. Thanks.
You can't enable semaphores as that hw does not support semaphores, that is what the kernel is telling you.
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