A small update. Today I have struck a lucky chord: it's already almost 5h uptime and not a single hang (and, therefore, my wireless connection is working happily). If I do a dmesg, the following suspicious lines appear:
[17179641.092000] cdrom: sr0: mrw address space DMA selected [17179641.116000] Assertion failed! qc->n_elem > 0,drivers/scsi/libata-core.c,ata_fill_sg,line=2531 [17179641.376000] cdrom: sr0: mrw address space DMA selected [17179641.380000] Assertion failed! qc->n_elem > 0,drivers/scsi/libata-core.c,ata_fill_sg,line=2531 Whatever that means, I have not seen them before (and I don't remember updating the kernel from yesterday to today). The system seems to work perfectly fine, with no evident negative consequences of the failed assertion, and with no hangs. The CD works seemingly OK, and copying large files out of it doesn't clog the CPU, but the maximum transfer speed seems to be around 2 MB/s. I'd rather endure that than the hangs. If any of you know of any way to force the "mrw address space DMA", that might be a good enough workaround for the moment... I'll leave the computer running overnight to be sure, and then reboot and see if it magically works again... -- ata_piix problem with Intel ICH7 chipset https://launchpad.net/bugs/53754 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs