Using Linux Mint 14 MATE 32bit, on a Dell Latitude Laptop D630, (yes old I know, and I am hoping this isn't the reason why) and occasionally the computer just goes into Power STANDBY Mode by itself.
I have disabled the screen-saver, confirmed in power management, that:
Put display in sleep mode is never ( on both AC power and battery)
Put computer to sleep mode when inactive is never ( on both AC power and battery)
Unticked dim display when idle
I set the display brightness to 50% ( to see if this helped ) no go
Removed the laptop battery and the problem still occurred. (in case it was the batter)
I have checked the MINT website and it claims the Hardware should work fine:
http://community.linuxmint.com/hardware/view/13797
wsmint ~ # uname -a
Linux wsmint 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:32:08 UTC 2012 i686 i686 i686 GNU/Linux
tail -f /var/log/syslog : this had nothing, related....
Here are the usb devices plugged into the laptop:
wsmint ~ # lsusb
Bus 002 Device 003: ID 050d:705a Belkin Components F5D7050 Wireless G Adapter v3000 [Ralink RT2571W]
Bus 005 Device 002: ID 15d9:0a4c Trust International B.V. USB+PS/2 Optical Mouse
Bus 007 Device 002: ID 0b97:7761 O2 Micro, Inc. Oz776 1.1 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 003: ID 0b97:7772 O2 Micro, Inc. OZ776 CCID Smartcard Reader
Here is Udev showing a problem that looks to be backlight / battery related.
(this is why I reduced the backlight brightness / removed the battery)
smint ~ # udevadm monitor
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent
KERNEL[657.677240] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
UDEV [657.678121] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
KERNEL[657.880412] change /devices/platform/regulatory.0 (platform)
UDEV [657.892063] change /devices/platform/regulatory.0 (platform)
KERNEL[657.924353] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
UDEV [657.925032] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
KERNEL[658.564269] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
UDEV [658.568978] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
KERNEL[664.688301] remove /devices/system/machinecheck/machinecheck1 (machinecheck)
KERNEL[664.688331] add /devices/system/machinecheck/machinecheck1 (machinecheck)
KERNEL[664.688350] change /devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/AC (power_supply)
KERNEL[664.688380] change /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
KERNEL[664.688399] change /devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3:1.0/ieee80211/phy1/rfkill0 (rfkill)
UDEV [664.696049] remove /devices/system/machinecheck/machinecheck1 (machinecheck)
UDEV [664.706234] change /devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/AC (power_supply)
UDEV [664.706271] add /devices/system/machinecheck/machinecheck1 (machinecheck)
UDEV [664.706291] change /devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3:1.0/ieee80211/phy1/rfkill0 (rfkill)
UDEV [664.706320] change /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
KERNEL[664.707661] remove /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
KERNEL[664.707818] add /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
UDEV [664.708704] remove /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
KERNEL[664.708947] change /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
UDEV [664.709789] add /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
UDEV [664.710441] change /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
KERNEL[748.531832] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
UDEV [748.532621] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
KERNEL[748.746654] change /devices/platform/regulatory.0 (platform)
UDEV [748.756603] change /devices/platform/regulatory.0 (platform)
KERNEL[748.776202] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
UDEV [748.777340] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
KERNEL[750.200381] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
UDEV [750.200946] change /devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight (backlight)
KERNEL[756.045282] remove /devices/system/machinecheck/machinecheck1 (machinecheck)
KERNEL[756.045311] add /devices/system/machinecheck/machinecheck1 (machinecheck)
KERNEL[756.045329] change /devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/AC (power_supply)
KERNEL[756.045359] change /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
KERNEL[756.045377] change /devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3:1.0/ieee80211/phy1/rfkill0 (rfkill)
UDEV [756.055219] remove /devices/system/machinecheck/machinecheck1 (machinecheck)
UDEV [756.055243] add /devices/system/machinecheck/machinecheck1 (machinecheck)
UDEV [756.055264] change /devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/AC (power_supply)
UDEV [756.068273] change /devices/pci0000:00/0000:00:1d.7/usb2/2-3/2-3:1.0/ieee80211/phy1/rfkill0 (rfkill)
UDEV [756.070392] change /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
KERNEL[756.072175] remove /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
KERNEL[756.072223] add /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
KERNEL[756.072453] change /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
UDEV [756.072914] remove /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
UDEV [756.073834] add /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
UDEV [756.074536] change /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
I changed the power supply and the fun kept going, so I removed the battery again and restarted problem still occurs any ideas..?
Thanks