[Bug 95161] New: skl_guc is not loaded

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95161

            Bug ID: 95161
           Summary: skl_guc is not loaded
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: paolo.stivanin at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I'm using Arch Linux x64 and my notebook hardware is:

CPU: i7-6700HQ
Video: Intel HD530 + Nvidia GTX 970m

With kernel 4.4.5-ARCH the Skylake GuC firmware was properly loaded:

cat /sys/kernel/debug/dri/1/i915_guc_load_status:

GuC firmware status:
    path: i915/skl_guc_ver4.bin
    fetch: SUCCESS
    load: SUCCESS
    version wanted: 4.3
    version found: 4.3

GuC status 0x800330ed:
    Bootrom status = 0x76
    uKernel status = 0x30
    MIA Core status = 0x3

Scratch registers:
     0:     0x0
     1:     0x0
     2:     0x0
     3:     0x5f5e100
     4:     0x600
     5:     0x0
     6:     0x0
     7:     0x0
     8:     0x11
     9:     0x0
    10:     0x0
    11:     0x0
    12:     0x0
    13:     0x0
    14:     0x0
    15:     0x0

but with kernel 4.5.2-ARCH the proprietary firmware is no longer loaded:

GuC firmware status:
    path: (null)
    fetch: NONE
    load: NONE
    version wanted: 4.3
    version found: 0.0
    header: offset is 0; size = 0
    uCode: offset is 0; size = 0
    RSA: offset is 0; size = 0

GuC status 0x00000001:
    Bootrom status = 0x0
    uKernel status = 0x0
    MIA Core status = 0x0

Scratch registers:
     0:     0x0
     1:     0x0
     2:     0x0
     3:     0x0
     4:     0x0
     5:     0x0
     6:     0x0
     7:     0x0
     8:     0x0
     9:     0x0
    10:     0x0
    11:     0x0
    12:     0x0
    13:     0x0
    14:     0x0
    15:     0x0


dmesg |grep -i skl
[    0.000000] ACPI: DMAR 0x000000005F8399E8 0000A8 (v01 INTEL  SKL     
00000001 INTL 00000001)
[    3.966878] [drm] Finished loading i915/skl_dmc_ver1.bin (v1.26)


I have tried also:
- recompiling kernel 4.5, but nothing changed;
- compiling kernel 4.6-rc5, but nothing changed;
- compiling kernel drm-intel-nightly, but nothing changed (this one is using
skl_guc_ver6, which I have under /lib/firmware/i915)
- compiling kernel 4.5 and 4.6-rc5 with skl_guc_ver6, but nothing changed
- compiling linux-next, but nothing changed

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