[PATCH 0/2] HD-audio HDMI regression fixes with VGA-switcheroo

[Jörg-Volker Peetz]

Hello Takashi,

Takashi Iwai wrote, on 06/08/12 15:03:
> At Fri, 08 Jun 2012 13:26:57 +0200,
> Jörg-Volker Peetz wrote:
>>
>> Takashi Iwai wrote, on 06/07/12 12:15:
>>> Hi,
>>>
>>> this is a series of patches to fix the regressions of HD-audio HDMI
>>> on D-GPUs in 3.5-rc1 due to the support of VGA-switcheroo audio clients.
>>>
>>> The first patch adds a new helper function to vga-switcheroo and the
>>> second just uses that instead of an open code.
>>>
>>> Dave, if the first patch is OK, I'm going to apply it though sound tree.
>>> Let me know if any problem is found.
>>>
>>> Joerg, could you check whether this doesn't break your setup, too?
>>>
>>>
>>> thanks,
>>>
>>> Takashi
>>
>> Hello Takashi,
>>
>> I applied both your patches on 3.5-rc1. With this kernel I made three tests.
>> 1) After booting I switched off the discrete GPU via vga_switcheroo.
>>    Then ca. 210 times the message
>>
>>      hda-intel: spurious response 0x0:0x0, last cmd=0x170503
>>
>>    appears on the console and in the logs.
>>    Starting X and using the built-in USB web-cam work, as well as sound with
>>    mplayer2 works.
>>
>> 2) After booting I switched to the discrete GPU via
>>
>>      echo -n DDIS > /sys/kernel/debugfs/vgaswitcheroo/switch
>>
>>    Then I started X via startx. The desktop screen appears but the system
>>    freezes. No reaction on keyboard or touchpad input. The computer is not
>>    reachable via ethernet wire.
> 
> Hm, these issues aren't seen on 3.5-rc1 before my patches?
> If so, we need to fix now.
> 
No, these issues aren't seen on 3.5-rc1 without your patches. I'm able to start
X with the discrete GPU in use, direct rendering and the built-in USB camera work.
Probably unrelated: in both cases I'm unable to lower the screen brightness from
highest value. Without your patches it appears a warning:

  ACPI Warning: _BQC returned an invalid level (20120320/video-472)


>>
>> 3) After booting the machine freezes (hard-lock) when trying to switch to
>>    dynamic power mangement on the integrated GPU via
>>
>>      echo -n dynpm > /sys/class/drm/card0/device/power_method
>>
>>   at least two trace calls are done. On the console only the last two lines of
>>   one call trace and the last one are visible (machine is frozen). It says
>>   (typed by hand, therefore, not complete):
> 
> This is an irrelevant issue with my patches.
> 
> 
> thanks,
> 
> Takashi

-- 
Best regards,
Jörg-Volker.