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| author | David S. Miller <davem@davemloft.net> | 2010-04-12 01:53:53 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-12 01:53:53 +0400 |
| commit | 871039f02f8ec4ab2e5e9010718caa8e085786f1 (patch) | |
| tree | f0d2b3127fc48c862967d68c46c2d46668137515 /Documentation/sound | |
| parent | e4077e018b5ead3de9951fc01d8bf12eeeeeefed (diff) | |
| parent | 4a1032faac94ebbf647460ae3e06fc21146eb280 (diff) | |
| download | linux-871039f02f8ec4ab2e5e9010718caa8e085786f1.tar.xz | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts:
drivers/net/stmmac/stmmac_main.c
drivers/net/wireless/wl12xx/wl1271_cmd.c
drivers/net/wireless/wl12xx/wl1271_main.c
drivers/net/wireless/wl12xx/wl1271_spi.c
net/core/ethtool.c
net/mac80211/scan.c
Diffstat (limited to 'Documentation/sound')
| -rw-r--r-- | Documentation/sound/alsa/HD-Audio.txt | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt index f4dd3bf99d12..98d14cb8a85d 100644 --- a/Documentation/sound/alsa/HD-Audio.txt +++ b/Documentation/sound/alsa/HD-Audio.txt @@ -119,10 +119,18 @@ the codec slots 0 and 1 no matter what the hardware reports. Interrupt Handling ~~~~~~~~~~~~~~~~~~ -In rare but some cases, the interrupt isn't properly handled as -default. You would notice this by the DMA transfer error reported by -ALSA PCM core, for example. Using MSI might help in such a case. -Pass `enable_msi=1` option for enabling MSI. +HD-audio driver uses MSI as default (if available) since 2.6.33 +kernel as MSI works better on some machines, and in general, it's +better for performance. However, Nvidia controllers showed bad +regressions with MSI (especially in a combination with AMD chipset), +thus we disabled MSI for them. + +There seem also still other devices that don't work with MSI. If you +see a regression wrt the sound quality (stuttering, etc) or a lock-up +in the recent kernel, try to pass `enable_msi=0` option to disable +MSI. If it works, you can add the known bad device to the blacklist +defined in hda_intel.c. In such a case, please report and give the +patch back to the upstream developer. HD-AUDIO CODEC |