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SubjectRe: Possible critical VIA vt82c686a chip bug
From
Date
Vojtech Pavlik <vojtech@suse.cz> writes:

> On Thu, Oct 26, 2000 at 03:58:21PM +0200, Yoann Vandoorselaere wrote:
>
> > > I've found a bug in my VIA SuperSouth (vt82c686a) chip (ISA bridge
> > > revision 0x12, silicon rev CD) on my FIC VA-503A rev 1.2:
> > >
> > > When there is heavy disk activity (several tars running concurrently on
> > > UDMA66 drive, or tar'ing from one UDMA66 drive to another over two
> > > channels), the system time, namely gettimeofday() goes crazy - now and
> > > then it advances the time about 1:20 for a fraction of a second and then
> > > changes back to normal time.
> > >
> > > This causes X to blank the screen when it should not,
> >
> > Really strange, I'm getting exactly the same problem on a machine
> > with the same chipset...
>
> Could you send me your 'lspci -vvxxx' to confirm it's the very same
> chip?

00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 22)
Subsystem: VIA Technologies, Inc. VT82C686/A PCI to ISA Bridge
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
00: 06 11 86 06 87 00 10 02 22 00 01 06 00 00 80 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 06 11 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
40: 08 01 00 00 00 80 60 e6 05 01 c4 00 00 00 00 f3
50: 02 76 34 00 00 50 ab 90 00 06 f7 08 00 00 00 00
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 05 3e 00 02 00 00 f0 40 00 00 00 00
80: 00 00 00 00 00 1d 00 00 00 00 00 02 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 01 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00:07.4 Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 30)
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Capabilities: [68] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00: 06 11 57 30 00 00 90 02 30 00 00 06 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 68 00 00 00 00 00 00 00 00 00 00 00
40: 20 84 50 00 ba 70 00 00 01 40 00 00 00 00 00 00
50: 00 ff ff 88 54 00 00 00 00 ff ff 00 00 00 00 00
60: 00 00 00 00 00 00 00 00 01 00 02 00 00 00 00 00
70: 01 60 00 00 01 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 01 50 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00


--
-- Yoann http://www.mandrakesoft.com/~yoann/
"Programming is a race between programmers, who try and make more and more
idiot-proof software, and universe, which produces more and more remarkable
idiots. Until now, universe leads the race" -- R. Cook
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