[Bug 111623] No package C-states on Dell XPS 15 9570 after resume from deep sleep

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111623

--- Comment #18 from Don Hiatt <don.hiatt at intel.com> ---
It looks like once the driver is loaded with enable_guc=3, reloading the driver
with enable_guc=0 always fails and requires a reboot. This is what I was
running into earlier today.

Also, once the driver is loaded with enable_guc=0 we never get into rc6 as the
gpu is wedged. The only fix is to reboot or to load the driver with
enable_guc=3.

Same behavior with 'kbl_guc_32.0.3.bin'.

Looks to be a firmware issue.

--[load driver with enable_guc=3]---
[   39.892295] [drm] GuC communication stopped <---- driver removed

--[reload driver with enable_guc=0]---

[   57.712627] Setting dangerous option enable_guc - tainting kernel
[   57.712988] i915 0000:00:02.0: Found 64MB of eDRAM
[   57.712998] i915 0000:00:02.0: vgaarb: deactivate vga console
[   57.714338] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   57.714339] [drm] Driver supports precise vblank timestamp query.
[   57.715451] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin
(v1.4)
[   57.769281] i915 0000:00:02.0: GuC initialization failed -1
[   57.769285] i915 0000:00:02.0: Enabling uc failed (-5)
[   57.769291] i915 0000:00:02.0: Failed to initialize GPU, declaring it
wedged!

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