linux-kernel - Re: PC Beeps not working with HDA Intel module

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Date:	Mon, 02 Aug 2010 23:44:26 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Daniel J Blueman <daniel.blueman@...il.com>
Cc:	Shérab <Sebastien.Hinderer@...-lyon.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: PC Beeps not working with HDA Intel module

At Mon, 2 Aug 2010 22:41:40 +0100,
Daniel J Blueman wrote:
> 
> On 2 August 2010 19:14, Shérab <Sebastien.Hinderer@...-lyon.org> wrote:
> > Dear Daniel,
> >
> > Many thanks for your helpful e-mail and sorry for the delay, it was hard
> > to find the time for testing.
> >
> > Daniel J Blueman (2010/07/05 12:20 +0100):
> >>
> >> On Jun 26, 12:40 pm, Shérab <Sebastien.Hinderer@...-lyon.org> wrote:
> >> > Dear all,
> >> >
> >> > The problem is on a computer with an HDA Intel sound card, Intel G45
> >> > DEVCTG chip and appears will all version s of the kernel.
> >> >
> >> > Running e.g.
> >> > beep 440
> >> > produces a beep whose audible frequency is very low, definitely not 440
> >> > Hz.
> >> >
> >> > However, it is worth notiing that grub is able to produce a beep of the
> >> > right frequency at boot time.
> >> >
> >> > Can this problem be fixed ?
> >> >
> >> > Should you need any additional bit of information or testing, please ask.
> >>
> >> I was finding the same with my Dell Studio 1557.
> >
> > Good to know one is not alone.
> >
> >> It may be worth using some printk calls [1] showing what frequency
> >> value is sent to the codec,
> >
> > I applied your patch on top of
> > 9fe6206f400646a2322096b56c59891d530e8d51
> >
> > When a console bell is produced, one gets:
> > HDA beep: linear value 241
> >
> > And running the command
> > beep 440
> > produces the following output:
> > HDA beep: linear value 248
> >
> > Aso, the printk you added saying "printk(KERN_ERR "HDA beep: standard
> > value" never appears in the logs.
> > Was this result predictable ?
> > I thought that to each standard value one linear value would correspond,
> > or something like that.
> 
> I looked into this further, and on my Dell Studio 15 (with similar IDT
> codec), I get value 248 written with the linear calculation. The
> datasheet [http://www.idt.com/products/getDoc.cfm?docID=18716251] has
> conflicting information: page 28 tells us the HD Audio spec 'standard'
> calculation is used (ie freq=48000/4*val), but page 165 tells the
> linear calculation is used (ie freq=48000*(257-val)/1024).
> 
> A handy app on my phone tells me the frequency produced is 48.4Hz.
> Well, 48000/4*248~=48, so it is clear Linux is using the wrong
> calculation method.
> 
> Testing with value 27 (ie 48000/4*27~=440), we hear the expected tone:
> $ sudo ./hda-verb /dev/snd/hwC0D0 0x1c SET_BEEP_CONTROL 27
> (of course, your beep widget may not be 0x1c)
> 
> The problem is the assumption in patch_sigmatel.c:stac92xx_parse_auto_config():
> 
> 	/* setup digital beep controls and input device */
> #ifdef CONFIG_SND_HDA_INPUT_BEEP
> 	if (spec->digbeep_nid > 0) {
> 		hda_nid_t nid = spec->digbeep_nid;
> 		unsigned int caps;
> 
> 		err = stac92xx_auto_create_beep_ctls(codec, nid);
> 		if (err < 0)
> 			return err;
> 		err = snd_hda_attach_beep_device(codec, nid);
> 		if (err < 0)
> 			return err;
> 		if (codec->beep) {
> 			/* IDT/STAC codecs have linear beep tone parameter */
> 			codec->beep->linear_tone = 1;
> 			/* if no beep switch is available, make its own one */
> 			caps = query_amp_caps(codec, nid, HDA_OUTPUT);
> 			if (!(caps & AC_AMPCAP_MUTE)) {
> 				err = stac92xx_beep_switch_ctl(codec);
> 				if (err < 0)
> 					return err;
> 			}
> 		}
> 	}
> #endif
> 
> So, linear calculation is used for all SigmaTel/IDT codecs.
> 
> Takashi, is then (eg) a white-list the best way to select linear
> calculation, as clearly IDT have reverted to the spec?

We may add a new field in stac_spec, set it in each patch_*(), and
just copy it to codec->beep->linear_tone at the place above.


thanks,

Takashi
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