[Bug 74861] [hsw] Fast audio playback on Intel Haswell HDMI due to runtime pm

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=74861

--- Comment #15 from Peter Curtis <kernel at pcurtis.com> ---
(In reply to Takashi Iwai from comment #14)
> OK, now it's getting more interesting.  In Peter's case, eld#* don't show
> the ELD, thus it cannot work at all.  Unless he is willing to test without
> Nvidia driver, we cannot help at all.  One of principles of debugging is to
> isolate the problem.  Using Nvidia driver makes it impossible.
I had assumed Bumbleebee had disabled the driver and I have tested with and
without the driver via bummblebee. I have no problem booting without the nVidia
driver if there is a suitable boot option you can give me - I had to use
nouveau.modeset=0 to disable the nouveau driver in some kernels to get a
successful boot, is there a similar one to inhibit nVidia?
> 
> Meanwhile, in Daniel's case, the audio driver itself receives ELD properly,
> and the powerwell refcount isn't zero.  So, this looks as if it should work
> indeed, and worth to take a deeper look.
> 
> How is i915_power_domain_info in the working case (i.e. with
> i915.disable_power_well=0)?
> 
> Also, checking the following would be helpful to understand the problem:
> 
> - Can the machine boot without Nvidia graphics?  Some BIOS can disable it. 
> This reduces the possible bad interaction and concentrate on i915 driver.
Nothing in Bios settings in my case
> 
> - Boot with drm.debug=0x0e option and take the dmesg output for both working
> and non-working cases.
> 
> - Install intel-gpu-tools package and run intel_reg_dumper and
> intel_audio_dump programs, save the outputs for both working and non-working
> cases.
> 
> - Test with power_save_controller=0 option for snd-hda-intel instead of
> i915.disable_power_well=0 option.
Are any of the above useful even with nVidia drivers?

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