Putting the information received in an email from original poster: First of all here is some explanation: http://www.tecchannel.de/ueberblick/archiv/401770/index10.html This problem is very old, so most links I gathered are no longer valid. See also the attachment.
The kernel version that i use currently is from Kano and is vanilla except that it includes my patch. This is the output from uname: Linux 2.6.22-9-generic #1 SMP Sun Jul 29 23:15:02 CEST 2007 i686 GNU/Linux My CPU is a Pentium III (Coppermine) with 256 KB cache, and runs at 1000Mhz When the quirk is activated, the following kernel message is emitted in dmesg (see also the kernel source for drivers/pci/quirks.c): [ 83.161307] Applying VIA southbridge workaround. I started noticing this problem with my Pentium III some years ago when I still used Windows 98. It appeared that my new DVD writer burned nothing but coasters. (Not CD-R's, only DVD-R's were coasters constantly) First I blamed the store and the DVD burner manufacturer (Benq), but after getting a replacement that exhibited the exact same behavior, my attention turned to my motherboard. I found a patch for windows 98 that does the exact same thing as the Linux quirk workaround does, and my DVD burns were succes- ful from then on. In XP access to the PCI subsystem is more restricted, so the programmatical fix I had for windows 98 didn't work there, I would have required a VxD driver. This PC was getting old and i decided to use it as a Linux server. Ofcourse, in Linux you can happily patch the kernel, and the Linux kernel even contained the fix already. More about that later. The problem is that the VIA Southbridge 686B has problems with the master priority rotation, which means as much as that the CPU isn't given back control over the PCI bus for a too long period of time. The CPU eventually forcibly takes back the control, corrupting the data currently on the PCI bus. This was causing the coasters and the general flaky behavior. It seems the problems are amplified if you also have a Sound Blaster Live PCI sound card in your system (which I do). It allegedly doesn't follow the PCI specification quite to the T, worsening the problem. Now, the quirk workaround was already present in the Linux kernel, inside drivers/pci/quirks.c, but my southbridge's PCI-ID wasn't listed, so it wasn't activated. As soon as I added mine and recompiled, the fix was activated and I could also burn DVD's in Linux. I have used this patch for years now, and it would definitely be very nice if it made it into the mainline kernel tree. Regards, [name deleted in case he won't be identified] -- VIA southbridge Intel id missing https://bugs.launchpad.net/bugs/128289 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
