Hi,
Have you:
Run a disk check (fsck?) and checked the SMART status of your drives?
Run a RAM check - using the ful live CD, you can run that for a few hours and
tell you if your RAM is ok.
The above two have given me the same problem in the past.
The current thing giving me that problem is a rubbish graphics card, which I
notice getting to 98degC and has caused the computer to lock up, and the
screen to go blank. It replaced another rubbish grphics card which did the
same thing, but the screen remained visible, just didn't change.
cheers
Jon
On Sat, 12 Feb 2011 10:44:17 pm you wrote:
> I have a problem with an Ubuntu 10.4 desktop.
> It regularly ends up unresposive, with a blank screen, often after being
> left alone for a while, a few hours or overnight. But can happen while
> using machine, where it just stops being able to respond to mouse or
> keyboard with no recovery.
> No response to keyboard or mouse.
> [ctl] [alt] [backspace] has no effect.
> Only able to recover by hard shutdown.
> I initially thought it might be firefox so shut that down when I left
> the machine, it still happened.
> I removed some backup software that I no longer used incase I had
> misconfigured it as at times I got a message on booting that /etc was
> full and had a memory of /etc being the default place for creating some
> backups. df did not show /etc was full. Still happens.
> Reinstalled /, (have separate /home partition), still happens.
>
> Output of dmesg after a restart contains many repeats of below sequence,
> as does dmesg command output done at other times.
> Is this a clue to something?
> Are their other places that I should be looking?
>
> [11017.517434] ata1.00: status: { DRDY DRQ }
> [11017.517446] ata1: soft resetting link
> [11017.868242] ata1.00: configured for UDMA/100
> [11017.868268] ata1: EH complete
> [12817.481237] ata1: drained 32768 bytes to clear DRQ.
> [12817.516675] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
> frozen
> [12817.516681] ata1.00: failed command: SMART
> [12817.516689] ata1.00: cmd b0/d1:01:00:4f:c2/00:00:00:00:00/00 tag 0
> pio 512 in
> [12817.516690] res 58/00:00:00:4f:c2/00:00:00:00:00/00 Emask
> 0x2 (HSM violation)
> [12817.516694] ata1.00: status: { DRDY DRQ }
> [12817.516705] ata1: soft resetting link
> [12817.864267] ata1.00: configured for UDMA/100
> [12817.864297] ata1: EH complete
> [14617.476629] ata1: drained 32768 bytes to clear DRQ.
> [14617.512669] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
> frozen
> [14617.512676] ata1.00: failed command: SMART
> [14617.512684] ata1.00: cmd b0/d1:01:00:4f:c2/00:00:00:00:00/00 tag 0
> pio 512 in
> [14617.512685] res 58/00:00:00:4f:c2/00:00:00:00:00/00 Emask
> 0x2 (HSM violation)
> [14617.512690] ata1.00: status: { DRDY DRQ }
> [14617.512700] ata1: soft resetting link
> [14617.860228] ata1.00: configured for UDMA/100
> [14617.860246] ata1: EH complete
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