On Mon, Oct 11, 2004 at 09:06:23PM -0400, Lee Revell wrote: > On Mon, 2004-10-11 at 20:51, Mark Knecht wrote: > > On Mon, 11 Oct 2004 21:02:03 -0400, Peter Lutek <plutek@xxxxxxxxxxxx> wrote: > > > On Mon, 2004-10-11 at 19:01, Lee Revell wrote: > > > --snip-- > > > > But we can at least identify the problematic laptops, > > > > complain to the manufacturers, and warn people not to buy them. > > > > > > has anyone yet compiled such a list? > > > > > > I suppose my laptop (also a Compaq - an R3070us) could be considered a > > 'problematic' laptop also, but my thought is that I don't really care > > about ACPI when I'm doing audio anyway. I'm not running on batteries > > or doing any of that sort of stuff when I'm recording and mixing. I > > want ACPI and every other distraction to the machine turned off. For > > instance, I'm seeing far fewer xruns still with fluxbox. I see one or > > two under Gnome. I see bunches of them under KDE. So, at least with > > ACPI off, I think it's not so certain that ACPI is the *only* problem > > here. > > > > The LKML poster's main point was that if your laptop implements ACPI > with SMM you WILL get xruns because SMM disables interrupts. Even > disabling ACPI in the kernel will not eliminate the problem 100% because > the hardware sensors will cause the machine to go to SMM mode to enable > the fan for example. > > So this _is_ definitely a problem IF your laptop uses SMM to implement > ACPI. It remains to be seen how widespread the issue is, and whether > there is a way to tell whether a given machine has the problem other > than trial and error. APM is implemented with SMM. turning off ACPI will give you problems. (we are talking about the sub milisecond latency range here) i still see some hope to fix this stuff by disabling APM (which is done by the ACPI code) but not using ACPI. will experiment with this stuff during the weekend.... -- torben Hohn http://galan.sourceforge.net -- The graphical Audio language
