Adding "acpi_osi=Linux" to the GRUB_CMDLINE_LINUX_DEFAULT parameter in /etc/default/grub makes the hotkeys adjust the brightness monotonically on my 1005pe. I have also updated my bios to version 0706, but I don't think this made a difference.
In /etc/default/grub I have:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"
Adding "acpi_osi=Linux" to the GRUB_CMDLINE_ LINUX_DEFAULT parameter in /etc/default/grub makes the hotkeys adjust the brightness monotonically on my 1005pe. I have also updated my bios to version 0706, but I don't think this made a difference.
In /etc/default/grub I have:
GRUB_CMDLINE_ LINUX_DEFAULT= "quiet splash acpi_osi=Linux"