Bugged ES1978 Maestro 2E (rev 10) ? make it works

[jean@schurger.org]

Hi,
	I have an (old) laptop with an ESS Technology ES1978 Maestro 2E
	(rev 10), that seems to have an "STAC9721/23" inside (id =
	0x83847609).

	0000:00:08.0 Multimedia audio controller: ESS Technology ES1978 Maestro
	2E (rev 10)
	Subsystem: Dell: Unknown device 00aa
	Flags: bus master, medium devsel, latency 32, IRQ 5
	I/O ports at d800 [size=256]
	Capabilities: [c0] Power Management
	version 2

	in the snd_ac97_mixer() function,  the ac97 driver test the
	AC97_REC_GAIN register by writing 0x8a06 on it, and if it read
	well the same value, it enable the AC97_SCAP_AUDIO.

	But, on my board, the last quartet of AC97_REC_GAIN, is always
	readen as 0, then when the AC97_REC_GAIN is tested, it return
	0x0a06 instead of 0x8a06, and the ac97 driver tell "(not audio
	or modem codec)", then no sound card.

	I simply added a test of 0x83847609 to |= 0x8000 to the test
	value, and all works fine.


--
	Jean Schurger <jean@schurger.org>


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