pata_via causes system freeze

Since ubuntu has switched from ide to pata (specifically from via82cxxx to pata_via), my Sony PCG-FR285E laptop eventually freezes on hard disk i/o, after some minutes or some hours of use, independently of disk activity.

I've rebuilt the ubuntu karmic kernel enabling via82cxxx and disabling pata_via. This has solved the problem.

Under Intrepid, comment #46 of bug #213639 (https://bugs.launchpad.net/linux/+bug/213639/comments/46) fixes the problem too.

This upstream bug report: http://bugzilla.kernel.org/show_bug.cgi?id=11426 might be the same issue (though I don't use my optical drive).

ProblemType: Bug
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: fradi 1607 F.... pulseaudio
CRDA: Error: [Errno 2] No existe el fichero ó directorio
Card0.Amixer.info:
 Card hw:0 'V8235'/'VIA 8235 with AD1981B at 0x1800, irq 11'
   Mixer name : 'Analog Devices AD1981B'
   Components : 'AC97a:41445374'
   Controls : 34
   Simple ctrls : 22
Card1.Amixer.info:
 Card hw:1 'modem'/'VIA 82XX modem at 0x1c00, irq 11'
   Mixer name : 'Conexant id 23'
   Components : 'AC97m:43585423'
   Controls : 2
   Simple ctrls : 2
Card1.Codecs.codec97.0.mc97.1.1:
 1-1/0: Conexant id 23

 Extended modem ID: codec=1 LIN1
 Modem status : PRA(GPIO) PRB(res) PRC(ADC1) PRD(DAC1) PRE(ADC2) PRF(DAC2) PRG(HADC) PRH(HDAC)
 Line1 rate : 8000Hz
Date: Fri Nov 20 22:13:46 2009
DistroRelease: Ubuntu 9.10
MachineType: Sony Corporation PCG-FR285E(FR)
NonfreeKernelModules: nvidia
Package: linux-image-2.6.31-14-generic 2.6.31-14.48
PccardctlIdent:
 Socket 0:
   no product info available
 Socket 1:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
 Socket 1:
   no card
ProcCmdLine: root=UUID=89815dd2-aca4-4b14-b0f2-a0489e0d9d7d ro quiet splash crashkernel=384M-2G:64M,2G-:128M
ProcEnviron:
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 linux-backports-modules-2.6.31-14-generic N/A
 linux-firmware 1.24
RfKill:

SourcePackage: linux
Uname: Linux 2.6.31-14-generic i686
dmi.bios.date: 09/25/2003
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R0112K6
dmi.board.name: Q51-Project
dmi.board.vendor: Sony Corporation
dmi.board.version: 01
dmi.chassis.asset.tag: 9K3M00000000000000000010
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrR0112K6:bd09/25/2003:svnSonyCorporation:pnPCG-FR285E(FR):pvr01:rvnSonyCorporation:rnQ51-Project:rvr01:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: PCG-FR285E(FR)
dmi.product.version: 01
dmi.sys.vendor: Sony Corporation