Red Hat Bugzilla – Bug 301991
Disabling ACPI results in no networking (laptop)
Last modified: 2008-02-15 21:42:17 EST
Description of problem:
In order to install Fedora 7 onto an Acer Aspire 5050-4697 it is necessary to
start the installer and the system once installed with the kernel command line
boot option acpi=off. The problem with this on this particular model (I'm not
sure if it also happens on other machines) is that when booting the sysem
without the acpi=off argument, the system stalls at boot, like a hang. Upon
removing 'quiet' from the kernel command line, there are two messages before the
ACPI Exception (processor_core-0781): AE_NOT_FOUND, Processor Device is not
Switched to high resolution mode on CPU #0
Unfortunately, there is no record of the failed boot in the logs upon reboot
with acpi=off. But there is also another problem when booting with acpi=off,
there is no network connectivity. The device is there (in this case eth0 is an
RTL 8139), but upon bringing it up, it never connects. In order to conduct a
test, I used a LiveCD distribution, Linux Mint in this case, to try and isolate
the issue. The kernel in this LiveCD is 2.6.20, and it boots with ACPI enabled
just fine on this equipment (network connects and functions normally), however
upon disabling ACPI, I was able to reproduce the issue of Fedora.
I am unable to send a smolt profile, due to the lack of networking. However,
here is the output of lspci -vv: http://pastebin.com/f73903a30
The installation F7 i386 DVD has kernel panic upon boot, as do both images of
FC6 (i386 and x86_64).
Version-Release number of selected component (if applicable):
This happens with kernels as back as 2.6.15 in FC5 install DVD, however the
latest 18.104.22.168-76_fc7 in Fedora 7 presents the very same problem.
Steps to Reproduce:
1. Boot the system with ACPI enabled (default)
System stalls with above mentioned messages being the last two printed to the
screen, acpi=off results in no network connection possible.
The system to boot normally.
Created attachment 203311 [details]
22.214.171.124 Fedora 7 kernel configuration.
Created attachment 203321 [details]
Linux Mint kenrel configuration (working ACPI)
I don't know why, but adding noapic and nolapic command line kernel options got
the network working with acpi=off, still the base problem is there, why do some
systems require acpi to be completely disabled?
I'm reviewing this bug as part of the kernel bug triage project, an attempt to
isolate current bugs in the Fedora kernel.
I am CC'ing myself to this bug and will try and assist you in resolving it if I can.
There hasn't been much activity on this bug for a while. Could you tell me if
you are still having problems with the latest kernel?
If the problem no longer exists then please close this bug or I'll do so in a
few days if there is no additional information lodged.
Closing as per previous comment. Please re-open if this is still an issue for you.