Ubuntu 64bit installation freezes 3-5 times per day on my new desktop comupter. Only cold reboot is possible. I suppose the issues is due the SSD hybrid drive (Seagate Momentus 7200 FDE.2 ST950042) with 4 GB SSD Cache. But I don't find any log or hint what it might be except the following error:
dmesg | grep -i error [ 1.066073] pci0000:00: ACPI _OSC request failed (AE_ERROR), returned control mask: 0x1d [ 1.739775] ACPI Error: [DSSP] Namespace lookup failure, AE_NOT_FOUND (20110623/psargs-359) [ 1.739783] ACPI Error: Method parse/execution failed [\_SB_.PCI0.SAT0.SPT1._GTF] (Node ffff880211076000), AE_NOT_FOUND (20110623/psparse-536) [ 1.742334] ACPI Error: [DSSP] Namespace lookup failure, AE_NOT_FOUND (20110623/psargs-359) [ 1.742343] ACPI Error: Method parse/execution failed [\_SB_.PCI0.SAT0.SPT1._GTF] (Node ffff880211076000), AE_NOT_FOUND (20110623/psparse-536) [ 1.743891] ACPI Error: [DSSP] Namespace lookup failure, AE_NOT_FOUND (20110623/psargs-359) [ 1.743894] ACPI Error: Method parse/execution failed [\_SB_.PCI0.SAT0.SPT2._GTF] (Node ffff880211076078), AE_NOT_FOUND (20110623/psparse-536) [ 1.744792] ACPI Error: [DSSP] Namespace lookup failure, AE_NOT_FOUND (20110623/psargs-359) [ 1.744796] ACPI Error: Method parse/execution failed [\_SB_.PCI0.SAT0.SPT2._GTF] (Node ffff880211076078), AE_NOT_FOUND (20110623/psparse-536) [ 9.442399] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro