On my Intel NUC6I5, using kernel 4.5.0-rc3, the drm firmware is not loaded journalctrl says: Feb 11 21:56:14 linux kernel: [drm:parse_csr_fw [i915]] *ERROR* Unknown stepping info, firmware loading failed Feb 11 21:56:14 linux kernel: [drm:csr_load_work_fn [i915]] *ERROR* Failed to load DMC firmware, disabling rpm hardware: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 78 model name : Intel(R) Core(TM) i5-6260U CPU @ 1.80GHz stepping : 3 microcode : 0x6a cpu MHz : 499.992 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 22 wp : yes ls /lib/firmware/i915 : -rw-r--r-- 1 root root 5872 24. Sep 16:07 bxt_dmc_ver1_04.bin -rw-r--r-- 1 root root 5872 24. Sep 16:07 bxt_dmc_ver1_05.bin -rw-r--r-- 1 root root 8380 24. Sep 16:07 bxt_dmc_ver1_06.bin lrwxrwxrwx 1 root root 19 18. Nov 21:50 bxt_dmc_ver1.bin -> bxt_dmc_ver1_06.bin -rw-r--r-- 1 root root 8824 24. Sep 16:07 skl_dmc_ver1_21.bin -rw-r--r-- 1 root root 8824 24. Sep 16:07 skl_dmc_ver1_22.bin -rw-r--r-- 1 root root 8824 20. Okt 01:27 skl_dmc_ver1_23.bin -rw-r--r-- 1 root root 8928 11. Feb 21:53 skl_dmc_ver1_26.bin lrwxrwxrwx 1 root root 38 11. Feb 21:53 skl_dmc_ver1.bin -> /lib/firmware/i915/skl_dmc_ver1_26.bin -rw-r--r-- 1 root root 109636 24. Sep 16:07 skl_guc_ver1_1059.bin lrwxrwxrwx 1 root root 21 18. Nov 21:50 skl_guc_ver1.bin -> skl_guc_ver1_1059.bin -rw-r--r-- 1 root root 128320 24. Sep 16:07 skl_guc_ver4_3.bin lrwxrwxrwx 1 root root 18 18. Nov 21:50 skl_guc_ver4.bin -> skl_guc_ver4_3.bin
Looks like same as https://bugs.freedesktop.org/show_bug.cgi?id=94113
commit a41c8882592fb80458959b10e37632ce030b68ca Author: Mat Martineau <mathew.j.martineau@linux.intel.com> Date: Thu Jan 28 15:19:23 2016 -0800 drm/i915/skl: Fix DMC load on Skylake J0 and K0 should fix this
FYI looks like there may still be issue with i7 6560u Ubuntu 15.10 w/ 4.5 kernel. The extra J0 and K0 steppings are in the Ubuntu git source. dmesg: [ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.5.0-040500-generic root=UUID=6abf1642-e374-458e-8273-5b5162d58682 ro nvme i915 i915.enable_rc6=0 quiet splash vt.handoff=7 [ 1.567984] [drm:parse_csr_fw [i915]] *ERROR* Unknown stepping info, firmware loading failed [ 1.568002] [drm:csr_load_work_fn [i915]] *ERROR* Failed to load DMC firmware, disabling rpm [ 1.594551] [drm] Initialized i915 1.6.0 20151218 for 0000:00:02.0 on minor 0 [ 3.419529] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device [ 3.979845] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915]) cpuinfo: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 78 model name : Intel(R) Core(TM) i7-6560U CPU @ 2.20GHz stepping : 3 microcode : 0x6a cpu MHz : 612.046 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 22 wp : yes /lib/firmware/i915: -rw-r--r-- 1 root root 8824 Nov 20 08:04 skl_dmc_ver1_23.bin -rw-r--r-- 1 root root 8928 Mar 23 21:10 skl_dmc_ver1_26.bin lrwxrwxrwx 1 root root 38 Mar 24 17:51 skl_dmc_ver1.bin -> /lib/firmware/i915/skl_dmc_ver1_26.bin -rw-r--r-- 1 root root 109636 Nov 20 08:18 skl_guc_ver1_1059.bin -rw-r--r-- 1 root root 128320 Mar 23 20:23 skl_guc_ver4_3.bin lrwxrwxrwx 1 root root 37 Mar 23 21:38 skl_guc_ver4.bin -> /lib/firmware/i915/skl_guc_ver4_3.bin -rw-r--r-- 1 root root 129024 Mar 23 21:11 skl_guc_ver6_1.bin lrwxrwxrwx 1 root root 37 Mar 23 21:11 skl_guc_ver6.bin -> /lib/firmware/i915/skl_guc_ver6_1.bin
(In reply to John from comment #3) > FYI looks like there may still be issue with i7 6560u > > Ubuntu 15.10 w/ 4.5 kernel. The extra J0 and K0 steppings are in the Ubuntu > git source. The commit Mika references in comment #2 is in v4.6-rc1. I've sent a stable backport request, so it may eventually show up in your stable kernel.
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