On Wed, May 21, 2014 at 9:40 AM, Micah Dombrowski <mpdwibble@xxxxxxxxx> wrote: > On May 20, 2014, at 10:02 AM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote: > >> On Mon, May 19, 2014 at 6:37 PM, Micah Dombrowski <mpdwibble@xxxxxxxxx> wrote: >> Thanks for the problem report. If I understand correctly, the 4020 >> works fine when connected to a desktop PC, but not when connected to >> the Lenovo T530 laptop. > > Correct. > >> I use http://bugzilla.kernel.org as a place to collect info like this, >> so if you want, you can open a report there and attach the logs. Or >> I'd be glad to do that for you if you just include them in email. > > I opened a report https://bugzilla.kernel.org/show_bug.cgi?id=76641 > > And attached dmesg and lspci -vv output from both systems. Thanks. I don't see any obvious PCI configuration differences between the PC and the T530. And it's all the same hardware in both cases; the only hardware difference would be the PCIe link from the Root Port to the PCIe-to-PCI bridge on the ExpressCard. That link is the same width, same speed, same max payload size in both machines. You seem to have comedi driver version 0.7.76.1 on the PC (where it works) and version 0.7.76 on the T530 (where it doesn't). I'd try the same driver version on both. >From your initial description, I suspect some sort of interrupt problem. Can you use /proc/interrupts to get an idea of how many interrupts per second the driver is handling, and compare that between the two systems? Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
