Bernhard Rosenkränzer wrote: > Hi, > I recently got an Acer Aspire 7720 using BIOS 1.43. Obviously, the first thing > to do was install Linux (currently running 2.6.27-rc4). > > Everything is working, but under heavy load, the machine tends to shut down > without prior warning. Unlike the similar problem described at > http://bugzilla.kernel.org/show_bug.cgi?id=9167, /proc/acpi/thermal_zone/TZ01/temperature > does show the correct temperature all the time, and the fan does turn on. > > I've looked at the DSDT and found a huge number of obvious bugs (_OSC taking > the wrong number of arguments and actually having an off-by-one bug when > looking at the arguments -- looks like someone didn't know ACPI arguments > start at Arg0 and then increased the argument count by 1 so he could get the > 4th argument in Arg4; Funny comparisons like > If (LOr (LGreater (OSYS, 0x07D0), LLess (OSYS, 0x07D7))) > (not that that could ever not be true...); doesn't even compile.....), but > fixing them doesn't help. > > I've tried all sorts of things to get it to behave, including patching the > DSDT to actually know about the fact that TZ01 is connected to the CPUs and > throttling the CPUs may help: > > Method (_PSV, 0, Serialized) > { > Return (3552) // 3552 = (273.2+82.0)*10 > } > > Method (_PSL, Package() { > \_PR.CPU0, > \_PR.CPU1 > }) > > Name (_TC1, 3) > Name (_TC2, 4) > Name (_TSP, 20) > Name (_TZP, Zero) > > (This part works nicely by the way) > > But at some point, it still shuts down. > > Looking at sensors output, the box seems to shut down when it hits 85.0°C, > which is also what the coretemp module thinks is right (tjmax value) -- but > the DSDT sets the trip point at 110°C: > > Method (_CRT, 0, Serialized) > { > Return (Add (0x0AAC, Multiply (0x6E, 0x0A))) > } > > Guess this explains why I'm getting a sudden shutdown instead of a clean > shutdown through acpid - adjusting _CRT to return 84°C doesn't fix the > problem, but does let acpid shut down the system gracefully instead of just > going down. > > However, given that's what the DSDT says, my guess is the box has actually > been designed to run at 110°C and simply shouldn't be shutting down at 85°C > without warning - any ideas what may be causing this or how to fix it? > In theory they sell a version with Linux preinstalled, and are interested in engaging with Linux generally. Maybe you can find the kernel version, patches & Kconfig and see if their kernel is any better. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
