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SubjectRe: 2.4.4 Sound corruption [FIXED]
I have found the problem.  The VIA latency patch in
linux/drivers/pci/quirks.c at line 92 (quirk_vialatency()) should NOT be
applied for the VIA VT82C686A (only for the 686B). On my machine (at least)
it's causing problems (as documented below) and this bug (along with fix) is
only applicable on the 686B southbridge.

I have removed this code and everything is now fine on my system. The
problem is that the 686A and 686B have the same PCI IDs, else I would have
submitted a patch.

Should I send this information anywhere else to make sure it gets applied in
new kernels?

On Mon, Apr 30, 2001 at 01:29:15AM +0200, Charl P. Botha wrote:
> FWIW, I have established that my sound broke between 2.4.4-pre5 and
> 2.4.4-pre6. I.e. in pre5 it works and in pre6 it doesn't, same .config. If
> anyone has any clues, I'd be glad to know.
>
> On Sun, Apr 29, 2001 at 04:55:01PM +0200, Charl P. Botha wrote:
> > 2.4.4 has broken sound here in a very strange way. I have a debian testing
> > system, Abit KT7 (thus VIA KT133 chipset) and SB PC128 (es1371-based) sound
> > card.
> >
> > Up until 2.4.3 everything was fine. Now, however, when I send _anything_ to
> > /dev/dsp, I get continuous high-pitched beeping (nothing remotely resembling
> > what the sound card should be doing).
> >
> > The strange thing is that when I cause hard disk activity (find / -name "*")
> > the correct sound is produced in time with hard disc accesses (I have tried
> > this with DMA enabled and disabled on the drive, same results). Also, when I
> > switch desktops (icewm, XFree86 4.0.2, Nvidia 0.9.767 drivers) the correct
> > sound is (very) momentarily produced (almost non-detectibly). After these
> > periods of lucidity, the sound card returns to its high-pitched cacophony.
> >
> > I have attached copies of both /proc/interrupts and /proc/pci. If anyone
> > requires more information, please say the word. I am not subscribed to this
> > list.
> >
> > Best regards,
> >
> > --
> > charl p. botha | computer graphics and cad/cam
> > http://cpbotha.net/ | http://www.cg.its.tudelft.nl/
>
> > CPU0
> > 0: 320161 XT-PIC timer
> > 1: 19658 XT-PIC keyboard
> > 2: 0 XT-PIC cascade
> > 8: 1 XT-PIC rtc
> > 9: 0 XT-PIC usb-uhci, usb-uhci
> > 10: 272660 XT-PIC nvidia
> > 11: 93973 XT-PIC eth0, es1371
> > 12: 42760 XT-PIC PS/2 Mouse
> > 14: 39388 XT-PIC ide0
> > 15: 5 XT-PIC ide1
> > NMI: 0
> > ERR: 0
>
> > PCI devices found:
> > Bus 0, device 0, function 0:
> > Host bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133] (rev 3).
> > Prefetchable 32 bit memory at 0xd8000000 [0xdbffffff].
> > Bus 0, device 1, function 0:
> > PCI bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133 AGP] (rev 0).
> > Master Capable. No bursts. Min Gnt=12.
> > Bus 0, device 7, function 0:
> > ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 34).
> > Bus 0, device 7, function 1:
> > IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 16).
> > Master Capable. Latency=32.
> > I/O at 0xd000 [0xd00f].
> > Bus 0, device 7, function 2:
> > USB Controller: VIA Technologies, Inc. UHCI USB (rev 16).
> > IRQ 9.
> > Master Capable. Latency=32.
> > I/O at 0xd400 [0xd41f].
> > Bus 0, device 7, function 3:
> > USB Controller: VIA Technologies, Inc. UHCI USB (#2) (rev 16).
> > IRQ 9.
> > Master Capable. Latency=32.
> > I/O at 0xd800 [0xd81f].
> > Bus 0, device 7, function 4:
> > Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 48).
> > IRQ 11.
> > Bus 0, device 8, function 0:
> > Multimedia video controller: Brooktree Corporation Bt878 (rev 17).
> > IRQ 9.
> > Master Capable. Latency=32. Min Gnt=16.Max Lat=40.
> > Prefetchable 32 bit memory at 0xde000000 [0xde000fff].
> > Bus 0, device 8, function 1:
> > Multimedia controller: Brooktree Corporation Bt878 (rev 17).
> > IRQ 9.
> > Master Capable. Latency=32. Min Gnt=4.Max Lat=255.
> > Prefetchable 32 bit memory at 0xde001000 [0xde001fff].
> > Bus 0, device 9, function 0:
> > Ethernet controller: Accton Technology Corporation SMC2-1211TX (rev 16).
> > IRQ 11.
> > Master Capable. Latency=32. Min Gnt=32.Max Lat=64.
> > I/O at 0xdc00 [0xdcff].
> > Non-prefetchable 32 bit memory at 0xde002000 [0xde0020ff].
> > Bus 0, device 13, function 0:
> > Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev 8).
> > IRQ 11.
> > Master Capable. Latency=32. Min Gnt=12.Max Lat=128.
> > I/O at 0xe000 [0xe03f].
> > Bus 1, device 0, function 0:
> > VGA compatible controller: nVidia Corporation NV11 (rev 161).
> > IRQ 10.
> > Master Capable. Latency=248. Min Gnt=5.Max Lat=1.
> > Non-prefetchable 32 bit memory at 0xdc000000 [0xdcffffff].
> > Prefetchable 32 bit memory at 0xd0000000 [0xd7ffffff].
>
>
> --
> charl p. botha | computer graphics and cad/cam
> http://cpbotha.net/ | http://www.cg.its.tudelft.nl/

--
charl p. botha | computer graphics and cad/cam
http://cpbotha.net/ | http://www.cg.its.tudelft.nl/
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