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hw/ac97: Mask out the EAPD bit on Powerdown Ctrl/Stat writes

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The Linux AC97 driver tests this bit to decide wether or not to show
an External amplifier toggle control.

This patch was also tested with a Windows XP guest without any issues.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: malc <av1474@comtv.ru>
This commit is contained in:
Hans de Goede 2012-05-07 09:24:38 +02:00 committed by malc
parent 7873bfb866
commit 847c25d01c
1 changed files with 1 additions and 1 deletions
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2
hw/ac97.c
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@ -603,7 +603,7 @@ static void nam_writew (void *opaque, uint32_t addr, uint32_t val)
mixer_reset (s);
break;
case AC97_Powerdown_Ctrl_Stat:
val &= ~0xf;
val &= ~0x800f;
val |= mixer_load (s, index) & 0xf;
mixer_store (s, index, val);
break;