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I've recently installed a second HDD bay in my laptop, but now, every time I issue a reboot, the computer hangs for about 1m30s (completely freezes on a black screen, with the fans at the maximum rpm). From what I've been able to gather, this only happens when I have a HDD/SDD on the main SATA port on the laptop (originally used for HDD, now with a SSD mounted). With the SSD mounted on the secondary SATA port (and no HDD on the main port), reboot is normal (no hang, pretty fast).

This happens in both Ubuntu 12.04/12.10 (Linux kernel 3.5) or Arch Linux (kernel 3.7), but also when rebooting from live USB. Don't have Windows installed, can't say if it would also happen.

The strange thing is, this only happens when issuing a restart, not when shutting down.

Any ideas/solutions?

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Try to pass reboot=bios or reboot=pci as a kernel boot parameter. Both of them solved the problem on my Aspire v3-471G laptop. For a complete list of <param> and their meanings, please refer to http://linux.koolsolutions.com/2009/08/04/howto-fix-linux-hangfreeze-during-reboots-and-restarts/.

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  • reboot=pci seems to have worked, reboot is now way faster, however my brightness control keys stopped working....
    – joaocandre
    Mar 18, 2013 at 11:33
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    To enable the brightness control keys, add acpi_backlight=vendor acpi_osi=linux.
    – Timothy Lin
    Mar 18, 2013 at 23:28

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