hw/ac97: Mask out the EAPD bit on Powerdown Ctrl/Stat writesqemu-kvm-1.0.1-usbredir

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>

1 files changed, 1 insertions, 1 deletions

diff --git a/hw/ac97.c b/hw/ac97.c
index a245c97e7..557f7b06d 100644
--- a/hw/ac97.c
+++ b/hw/ac97.c
@@ -600,7 +600,7 @@ 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;