Ubuntu on a Toshiba Satellite C55-A

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Here are notes from installing Ubuntu Linux 13.10 and 14.04.1 on a Toshiba C55-A laptop.

Computer hangs during boot (with a black screen and the backlight on)

Booting the Live DVD results in the computer freezing. Using acpi=off and pci=biosirq resulted in the boot getting further along (which you can debug by also removing the splash and quiet options), but ultimately it was necessary to add these kernel command line parameters both when booting from the Live DVD and in /boot/grub/grub.cfg:

acpi_osi=Linux acpi_backlight=vendor

Restoring dual boot after upgrading from Windows 8 to 8.1

After upgrading from Windows 8 to Windows 8.1, grub was no longer the default boot manager, effectively disabling dual boot. The computer would boot directly into Windows. Running boot-repair had no user-visible effect ( before: http://paste.ubuntu.com/9878486/ after: http://paste.ubuntu.com/9878525/ ). Using the Windows bcdedit command to set grub as the boot manager worked for me.

  • Search for "command prompt" in Windows search
  • Right click and run as Administrator
  • bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi
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