[Bug 91864] [SKL Regression] 2D and 3D accelerated programs are slow after booting on 4.2.0-rc8 drm-intel-nightly kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91864

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
The trigger is mesa/dri2 not loading:

[    10.124] (EE) AIGLX error: Calling driver entry point failed
[    10.125] (EE) AIGLX: reverting to software rendering
[    10.218] (II) AIGLX: Loaded and initialized swrast
[    10.218] (II) GLX: Initialized DRISWRAST GL provider for screen 0

which I guess is due to no context support. One most likely error from the
kernel is

Sep  3 11:40:41 SKLY7 kernel: [    6.301563] [drm:guc_fw_fetch] before
requesting firmware: GuC fw fetch status PENDING
Sep  3 11:40:41 SKLY7 kernel: [    6.302057] i915 0000:00:02.0: Direct firmware
load for i915/skl_guc_ver3.bin failed with error -2
Sep  3 11:40:41 SKLY7 kernel: [    6.302068] [drm:guc_fw_fetch] GuC fw fetch
status FAIL; err -2, fw           (null), obj           (null)
Sep  3 11:40:41 SKLY7 kernel: [    6.302166] [drm:intel_guc_ucode_init [i915]]
*ERROR* Failed to fetch GuC firmware from i915/skl_guc_ver3.bin (error -2)
Sep  3 11:40:41 SKLY7 kernel: [    6.309483] [drm:intel_guc_ucode_load] GuC fw
status: fetch FAIL, load NONE
Sep  3 11:40:41 SKLY7 kernel: [    6.309562] [drm:intel_guc_ucode_load] GuC fw
fetch status FAIL
Sep  3 11:40:41 SKLY7 kernel: [    6.309674] [drm:i915_gem_init_hw [i915]]
*ERROR* Failed to initialize GuC, error -5 (ignored)

which is meant to be ignored. However, the dmesg lacks the logging (needs
drm.debug|=1) to see why the context failed.

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