diff --git a/ac97/ac97.c b/ac97/ac97.c
index b2cbb1c..4c3aec5 100644
--- a/ac97/ac97.c
+++ b/ac97/ac97.c
@@ -73,9 +73,15 @@ codec_probe(uint16_t (*codec_read)(uint8_t reg),
     if (!silent)
         printf(" 3D");
     codec_write(0x22, 0xffff);
+    if (!silent)
+        printf(" PD");
+    codec_write(0x26, 0xcf00); /* don't power down internal and external clks, this disables the codec */
     if (!silent)
         printf(" EAID");
     codec_write(0x28, codec_read(0x28) | 0x0030);
+    if (!silent)
+        printf(" EACtl");
+    codec_write(0x2a, codec_read(0x2a) | 0xf800);
     if (!silent)
         printf(" C/LFE");
     codec_write(0x36, 0xbfbf);