I have a problem since yesterday. I updated the system and since then, I get the message “thinkpad_acpi unsupported brightness interface, please contact ibm-acpi-develatlists.sourceforge.net” when I boot. I can then hit Ctrl+D and the system boots as read-only.
I tried booting with the options “acpi_osi=Linux acpi_blacklight=vendor” but this did not help.
Any ideas what I could do?