1

Hopefully this is the place to ask this. My problem is that I have a PCIe device I'm trying to use on a home built computer. The card will only work on a full power cycle of the computer. I've tried this card on multiple motherboards and with many BIOS configurations, but no change. It only works on a hard shutdown and power up.

I'm running Ubuntu 12.10, and oddly enough sometimes the card will work on reboot when I restart from Windows 7. Same hardware. But this happens only rarely. Is there a way I can perform a reboot command, and have the power get fully cycled?

If I can't reconfigure the reboot to do a full power cycle, is there any way from the OS side to actually cycle power to a PCIe slot while the machine is on? I'm thinking that is a long shot.

Some info about my system (s)

Motherboard: ASUS P8 Z77 / ASROCK Z68M-ITX-HT / ASROCK Z77 Extreme

CPU: i7 3770K

Ram: 32Gb Corsair

Power Supply: Corsair HX 1050

PCIe device is a frame grabber to operate an industrial scientific camera

Improve this question

1 Answer 1

Reset to default
0

Take a look at man bootparam:

'reboot=[warm|cold][,[bios|hard]]'

Since Linux 2.0.22, a reboot is by default a cold reboot. One asks for the old default with 'reboot=warm'. (A cold reboot may be required to reset certain hardware, but might destroy not yet written data in a disk cache. A warm reboot may be faster.) By default, a reboot is hard, by asking the keyboard controller to pulse the reset line low, but there is at least one type of motherboard where that doesn't work. The option 'reboot=bios' will instead jump through the BIOS.

  1. You can edit /etc/default/grub, update GRUB_CMDLINE_LINUX variable, for example:
GRUB_CMDLINE_LINUX="reboot=hard"
  1. then execute command
sudo update-grub
  1. and then reboot.
  2. You can check your current kernel arguments by command:
cat /proc/cmdline
Improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .