It is great to see others have experienced this problem, and are trying
to find a solution!
The jitter/granular distortion that Tim (the other Tim!), Ico, and Derek
describe seems to match exactly what I am experiencing, however I think
my hardware is completely different.
I wanted to post information about my current state for the record
before I start experimenting with acpi and all the other suggestions.
I am only on the CCRMA and LAU list, so feel free to forward this info
to other lists, such as alsa or whatever.
Thanks!
-Tim
----------------------
I am running stock model ACER TavelMate254, which actually seems like a
decent quality machine:
TM254ELCi, LX.T3206.187
Processor Intel? Pentium? 4 processor 2.80GHz
Memory 512MB Hard Drive 40GB
Optical Drive CD-RW/DVD combo
TFT Display 15.0" XGA
Graphics Intel? Extreme Graphics 2
----------------------
I am running the latest PlanetCCRMA kernel and their alsa flavors.
----------------------
here is my lspci output:
00:00.0 Host bridge: Intel Corp. 82852/855GM Host Bridge (rev 02)
Flags: bus master, fast devsel, latency 0
Memory at <unassigned> (32-bit, prefetchable)
Capabilities: <available only to root>
00:00.1 System peripheral: Intel Corp. 855GM/GME GMCH Memory I/O Control
Registers (rev 02)
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, fast devsel, latency 0
00:00.3 System peripheral: Intel Corp. 855GM/GME GMCH Configuration
Process Registers (rev 02)
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, fast devsel, latency 0
00:02.0 VGA compatible controller: Intel Corp. 82852/855GM Integrated
Graphics Device (rev 02) (prog-if 00 [VGA])
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, fast devsel, latency 0, IRQ 5
Memory at e8000000 (32-bit, prefetchable) [size=128M]
Memory at e0000000 (32-bit, non-prefetchable) [size=512K]
I/O ports at 1800 [size=8]
Capabilities: <available only to root>
00:02.1 Display controller: Intel Corp. 82852/855GM Integrated Graphics
Device (rev 02)
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: fast devsel
Memory at f0000000 (32-bit, prefetchable) [size=128M]
Memory at e0080000 (32-bit, non-prefetchable) [size=512K]
Capabilities: <available only to root>
00:1d.0 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #1 (rev 03)
(prog-if 00 [UHCI])
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, medium devsel, latency 0, IRQ 5
I/O ports at 1820 [size=32]
00:1d.1 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #2 (rev 03)
(prog-if 00 [UHCI])
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, medium devsel, latency 0, IRQ 11
I/O ports at 1840 [size=32]
00:1d.2 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #3 (rev 03)
(prog-if 00 [UHCI])
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, medium devsel, latency 0, IRQ 4
I/O ports at 1860 [size=32]
00:1d.7 USB Controller: Intel Corp. 82801DB (ICH4) USB2 EHCI Controller
(rev 03) (prog-if 20 [EHCI])
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, medium devsel, latency 0, IRQ 10
Memory at e0100000 (32-bit, non-prefetchable) [size=1K]
Capabilities: <available only to root>
00:1e.0 PCI bridge: Intel Corp. 82801BAM/CAM PCI Bridge (rev 83)
(prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=64
I/O behind bridge: 00003000-00003fff
Memory behind bridge: e0200000-e02fffff
Prefetchable memory behind bridge: e0500000-e05fffff
00:1f.0 ISA bridge: Intel Corp. 82801DBM LPC Interface Controller (rev 03)
Flags: bus master, medium devsel, latency 0
00:1f.1 IDE interface: Intel Corp. 82801DBM (ICH4) Ultra ATA Storage
Controller (rev 03) (prog-if 8a [Master SecP PriP])
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, medium devsel, latency 0, IRQ 4
I/O ports at <unassigned>
I/O ports at <unassigned>
I/O ports at <unassigned>
I/O ports at <unassigned>
I/O ports at 1810 [size=16]
Memory at 20000000 (32-bit, non-prefetchable) [size=1K]
00:1f.3 SMBus: Intel Corp. 82801DB/DBM (ICH4) SMBus Controller (rev 03)
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: medium devsel, IRQ 10
I/O ports at 1880 [size=32]
00:1f.5 Multimedia audio controller: Intel Corp. 82801DB (ICH4) AC'97
Audio Controller (rev 03)
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, medium devsel, latency 0, IRQ 10
I/O ports at 1c00 [size=256]
I/O ports at 18c0 [size=64]
Memory at e0100c00 (32-bit, non-prefetchable) [size=512]
Memory at e0100800 (32-bit, non-prefetchable) [size=256]
Capabilities: <available only to root>
00:1f.6 Modem: Intel Corp. 82801DB (ICH4) AC'97 Modem Controller (rev
03) (prog-if 00 [Generic])
Subsystem: Acer Incorporated [ALI]: Unknown device 0038
Flags: bus master, medium devsel, latency 0, IRQ 10
I/O ports at 2400 [size=256]
I/O ports at 2000 [size=128]
Capabilities: <available only to root>
02:04.0 CardBus bridge: Texas Instruments PCI1250 PC card Cardbus
Controller (rev 01)
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, medium devsel, latency 168, IRQ 10
Memory at 20001000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=02, secondary=03, subordinate=03, sec-latency=176
Memory window 0: 20400000-207ff000 (prefetchable)
Memory window 1: 20800000-20bff000 (prefetchable)
I/O window 0: 00004000-000040ff
I/O window 1: 00004400-000044ff
16-bit legacy interface ports at 0001
02:04.1 CardBus bridge: Texas Instruments PCI1250 PC card Cardbus
Controller (rev 01)
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, medium devsel, latency 168, IRQ 10
Memory at 20002000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=02, secondary=04, subordinate=04, sec-latency=176
Memory window 0: 20c00000-20fff000 (prefetchable)
Memory window 1: 21000000-213ff000 (prefetchable)
I/O window 0: 00004800-000048ff
I/O window 1: 00004c00-00004cff
16-bit legacy interface ports at 0001
02:05.0 Network controller: Harris Semiconductor: Unknown device 3872
(rev 01)
Subsystem: AMBIT Microsystem Corp.: Unknown device 0200
Flags: bus master, medium devsel, latency 64, IRQ 11
Memory at e0500000 (32-bit, prefetchable) [size=4K]
Capabilities: <available only to root>
02:0a.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
Subsystem: Acer Incorporated [ALI]: Unknown device 0039
Flags: bus master, medium devsel, latency 64, IRQ 11
I/O ports at 3000 [size=256]
Memory at e0200000 (32-bit, non-prefetchable) [size=256]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: <available only to root>
03:00.0 Multimedia audio controller: Xilinx Corporation RME Hammerfall
DSP (rev 0b)
Flags: bus master, stepping, medium devsel, latency 64, IRQ 10
Memory at 20800000 (32-bit, non-prefetchable) [size=64K]
----------------------
proc / interrupts.
CPU0
0: 747357 XT-PIC timer
1: 699 XT-PIC keyboard
2: 0 XT-PIC cascade
4: 0 XT-PIC usb-uhci
5: 0 XT-PIC usb-uhci
8: 1 XT-PIC rtc
9: 9 XT-PIC acpi
10: 0 XT-PIC ehci_hcd, Texas Instruments PCI1250 PC
card Cardbus Controller, Texas Instruments PCI1250 PC card Cardbus
Controller (#2), hdsp
11: 106 XT-PIC usb-uhci, eth0
12: 9397 XT-PIC PS/2 Mouse
14: 21038 XT-PIC ide0
15: 11051 XT-PIC ide1
NMI: 0
ERR: 0
