[Bug 110617] [KBL] Video corrupted during playback with audio in KBL NUC using Clear Linux OS (Root Caused to GuC/HuC Firmware Authentication Issue)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110617

--- Comment #5 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Jon Ewins from comment #3)
> GuC and HuC are closed source signed binaries.  They are loaded, with the
> GuC first authenticated based on its embedded key and the GuC then
> supporting authentication of the HuC.  Of the kernel params you mentioned,
> i915.enable_guc=0x02 configures the system for use of the HuC.  The nuclear
> flip param should not be relevant.
> One observation is that the kernel in use here appears to have late uc
> loading (i915_gem_init_hw_late) that was required for Android boot
> operation, but never part of the upstream kernel. It is not clear if that is
> related.  
> * Please confirm that HuC authentication is successful on APL, not just that
> no video corruption is seen.  Mihgt be case if case media operation is
> different on APL.
> 
> * Is the guc/huc failure consistent on every run?
> 
> Note that we have confirmed locally that current drm-tip kernel with v32.0.3
> GuC fw is not showing an issue for KBL on general boot, IGT tests.
> 
> To aid further debugging, please enable following logging.
> First ensure the drm i915 debug level is set 
> drm.debug=0xe
> For GUC logs, set:
> i915.guc_log_level=3
> This requires that debugfs is configured.  GuC logs will be located after
> the test run at:
> /sys/kernel/debug/dri/0/i915_guc_log_dump
> (no debugfs must be enabled)
> If an issue happens in guc load such that the driver load fails, the driver
> will copy the log to
> /sys/kernel/debug/dri/0/i915_guc_load_err_log_dump
> before the driver is unrolled.
> please update the content of these files to this bugzilla, along with kernel
> dmesg log.

Reporter, can you please provide all necessary details as requested above.

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