http://bugzilla.kernel.org/show_bug.cgi?id=6519
------- Additional Comments From [EMAIL PROTECTED] 2006-05-15 13:58 ------- --- Linus Torvalds <[EMAIL PROTECTED]> wrote: > Now, the question is, why do you have no-hlt there? Was it some > strange > distro that set it for you? And why? I must admit I'd forgotten about the no-hlt, sorry. I added it to my grub.conf because I was getting occasional hangs on boot at "Checking 'hlt' instruction", perhaps 5-10% of the time. I first added it when running Fedora kernel 2.6.14-1.1656_FC4 . I added the no-hlt not knowing whether it would affect power saving or simply disable a potentially problematic test. With that kernel, adding no-hlt did not noticeably affect CPU temperature. We now know, or suspect, this is because that kernel had a bug/feature whereby ACPI power saving is controversially enabled for hardware that reports only C1 as a valid power state. At the time, I interpreted the fact that the temperature did not increase as showing that the "no-hlt" had simply disabled the test, not the power-saving. I hope this is a forgiveable mistake. When I upgraded to subsequent Fedora kernels, the existing kernel parameters, including no-hlt, were evidently automatically copied for the new entries in grub.conf . And these new kernels (2.6.15-1.1830_FC4 onward) did not have the same ACPI bug/feature, so suddenly my CPU temperature shot up because I now did not have power saving from hlt or ACPI. I have now confirmed that 2.6.16-1.2108_FC4 without no-hlt runs cool. Yes, I should have spotted and tested this before submitting the bug and I apologise for that. This leaves, apart from some embarrassment on my part, the question why I was getting hangs at "Checking 'hlt' instruction" with 2.6.14-1.1656_FC4 . Wouldn't it be neat if this turned out to have the same cause as the lock-up reported by Maneesh that motivated the "if (pr->power.states[i].type >= ACPI_STATE_C2)" revision! Dave Send instant messages to your online friends http://uk.messenger.yahoo.com ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ acpi-bugzilla mailing list acpi-bugzilla@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
