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[Launchpad Bug Tracker <1496163@xxxxxxxxxxxxxxxxxx>]

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[ Impact ]

On Skylake, skl_dmc firmware is not incorporated into the initramfs.
This is because it is a symlink to a versioned blob and the initramfs-
tools hook does not dereference symlinks. As the driver is actually
loaded from the initramfs, the firmware is missing for the lifetime of
the boot, which means that the GPU cannot enter its lowest available
power states plus some hotplugging scenarios are broken. This all
manifests itself as such in dmesg:

[    0.728803] i915 0000:00:02.0: Direct firmware load for i915/skl_dmc_ver1.bin failed with error -2
[    0.728817] [drm:i915_firmware_load_error_print [i915]] *ERROR* failed to load firmware i915/skl_dmc_ver1.bin (0)

[ Test Case ]

After the fix has been applied and the initrd regenerates, the firmware
should load successfully after a reboot.

[ Regression Potential ]

Unlikely, as the fix is part of Ubuntu since Wily.

** Affects: ubuntu-translations
     Importance: Undecided
         Status: New

** Affects: initramfs-tools (Ubuntu)
     Importance: Medium
     Assignee: Andy Whitcroft (apw)
         Status: Fix Released

** Affects: initramfs-tools (Ubuntu Trusty)
     Importance: Medium
     Assignee: Brian Murray (brian-murray)
         Status: Fix Committed

** Affects: initramfs-tools (Ubuntu Vivid)
     Importance: Medium
     Assignee: Andy Whitcroft (apw)
         Status: Won't Fix

** Affects: initramfs-tools (Ubuntu Wily)
     Importance: Medium
     Assignee: Andy Whitcroft (apw)
         Status: Fix Released


** Tags: amd64 apport-bug bios-outdated-0406 verification-needed
-- 
i915 firmware is not copied to initrd
https://bugs.launchpad.net/bugs/1496163
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