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klauter
n00b
Joined: 03 Dec 2006
Posts: 3
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 Posted: Tue Jan 16, 2007 8:12 am Post subject: Bad sound after kernel upgrade |
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I recently upgraded my kernel from gentoo-source 2.6.15-r1 to 2.6.18-r3.
Since then the music output from my CD & ogg players (alsaplayer, amarok) is approximately a semi-tone lower than it should be??? If i boot the old kernel the music output is correct.
Any idea what is causing this?
How can I fix it?
Here is some output from dmesg and emerge --search that might be usefull:
| Code: |
2.6.15-r1
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Advanced Linux Sound Architecture Driver Version 1.0.10rc3 (Mon Nov 07 13:30:21 2005 UTC).
ACPI: PCI Interrupt 0000:00:1f.5[B] -> GSI 17 (level, low) -> IRQ 20
PCI: Setting latency timer of device 0000:00:1f.5 to 64
intel8x0_measure_ac97_clock: measured 59376 usecs
intel8x0: clocking to 48000
ALSA device list:
#0: Intel ICH5 with AD1985 at 0xffa7f800, irq 20
oprofile: using NMI interrupt.
Real Time Clock Driver v1.12
alsa-lib = 1.0.13
alsa-utils = 1.0.13
alsa-headers = 1.0.13
2.6.18-r3
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Advanced Linux Sound Architecture Driver Version 1.0.12rc1 (Thu Jun 22 13:55:50 2006 UTC).
ACPI: PCI Interrupt 0000:00:1f.5[B] -> GSI 17 (level, low) -> IRQ 20
PCI: Setting latency timer of device 0000:00:1f.5 to 64
intel8x0_measure_ac97_clock: measured 56003 usecs
intel8x0: clocking to 45179
ALSA device list:
#0: Intel ICH5 with AD1985 at 0xffa7f800, irq 20
oprofile: using NMI interrupt.
Real Time Clock Driver v1.12ac
alsa-lib = 1.0.13
alsa-utils = 1.0.13
alsa-headers = 1.0.13
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I appreciate the help. |
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didymos
Advocate
Joined: 10 Oct 2005
Posts: 4798
Location: California
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| Posted: Tue Jan 16, 2007 10:47 am Post subject: |
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What modules are loaded?
_________________
Thomas S. Howard |
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Keruskerfuerst
Advocate
Joined: 01 Feb 2006
Posts: 2289
Location: near Augsburg, Germany
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| Posted: Tue Jan 16, 2007 10:51 am Post subject: |
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| Maybe the sampling frequency is not set correctly? |
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klauter
n00b
Joined: 03 Dec 2006
Posts: 3
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| Posted: Wed Jan 17, 2007 7:34 am Post subject: |
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I think you are right keruskerfuerst. The kernel that plays music correctly is clocking at 48000, while the newer kernel is clocking at 45179. As indicated in dmesg output.
| Code: |
Old kernel
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intel8x0_measure_ac97_clock: measured 56003 usecs
intel8x0: clocking to 48000
New kernel
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intel8x0_measure_ac97_clock: measured 56003 usecs
intel8x0: clocking to 45179
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However, I have no idea why this has changed or how to set it? Stranger still when I booted my machine today the sampling rate was correct???
The modules that are loaded are
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># lsmod
Module Size Used by
i915 19328 2
rtc 11700 0
ppdev 9092 0
lirc_dev 14340 0
8250_pnp 9728 0
8250 23684 1 8250_pnp
serial_core 18944 1 8250
serio_raw 6660 0
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Which module is responsible for sound?
Any ideas how to fix the problem? Thanks for you help! |
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didymos
Advocate
Joined: 10 Oct 2005
Posts: 4798
Location: California
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| Posted: Wed Jan 17, 2007 7:49 am Post subject: |
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None of those are sound modules. Alsa modules always start with snd.
_________________
Thomas S. Howard |
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