Your laptop is running without APM or ACPI.
You risk permanent heat damage.- Ensure you have Acer's most recent BIOS. If not, update it.
- If you needed to update, see if the OS will boot with the updated BIOS and ACPI.
- If you are already on the latest BIOS, or if a test of ACPI with the most recent BIOS fails, then determine if you can enable APM from its management screens.
Should you decide to stay with OpenBSD on this hardware -- whether the ACPI/APM problem is resolved or not -- you will want to install Radeon firmware. See all of the error messages in the last 15 lines of your dmesg(8) output. Installation may be performed with fw_update(1) once you have established a functioning network connection.