Most recent kernel where this bug did not occur: 2.6.11-1.1369_FC4 Distribution: Fedora FC4 Hardware Environment: HP Pavilion 9695C (Irongate) AMD Athlon 850MHz. BIOS Pandora (I think) Software Environment: Fedora FC4 Problem Description: I just upgraded from RH9 to FC4. The the distribution CDs I used provided 2.6.11-1.1369_FC4. The upgrade was successful and I was happy to see ACPI actually power off my machine when I did a shut down. Something I had missed when I went from XP to RH9. My next step was to upgrade using yum. This jumped me to 2.6.17-1.2139_FC4. ACPI was now disabled in boot up. After several days of poking araound doing before and after compares I found something that works. I added an acpi=force kernel parameter. ACPI loaded and shutdown now powers off the box. Steps to reproduce: shutdown -h now Power turns off when acpi is not disabled. See dmesg outputs (2.6.11, 2.6.17, 2.6.27 acpi=force) attached.
Created attachment 8521 [details] 2.6.11 dmesg showing successful acpi start
Created attachment 8522 [details] 2.6.17 dmesg showing acpi being disabled
Created attachment 8523 [details] 2.6.17 with kernel param acpi=force showing successfull acpi start
> ACPI: Disabling ACPI support acpi_blacklisted() returned true for this system. It should have printed more when it did this... Please attach the output from dmidecode. Also, if you can try a kernel.org kernel, that would be helpful, because Red Hat may have some blacklist entries that are not upstream.
I am getting # dmidecode 2.6 # No SMBIOS nor DMI entry point found, sorry. I could not find a google work-around for this. Is there some other way to get the output?
It looks like FC is blacklisting your laptop and not printing why. If you can reproduce this with a kernel.org kernel, please re-open, else file a bug with fedora.