On Thu, Jun 20, 2002 at 12:25:31AM +0100, Chris Rankin wrote: > Sure; it's just kernel modules. What's the worst that > could happen? (Apart from my CPU fans turning off and > my mobo bursting into flames, but hey ;-) !) lol... ;') You could try just insmod'ing i2c-i801 and not lm87 to see if that makes a difference. You can peek inside i2c-i801.c if you want to see how hanlding of the i801 works. In general, the Linux kernel does good accounting of resources to protect race conditions and such. It can't account for things outside of it's control, though, like strange subsystem/co-processor activity unless the kernel is specificly checking for that. I'm betting that the LM87 was configured to handle the temp/fan stuff automaticly, and when lm87.o is insmod'ed, it stomps on the initializations done by the Bios. Try commenting out that init line and installing the module. It should act much more 'passively' then, and only read values instead of completely initializing the chip from scratch. Phil > > I was wondering; does the i2c-i801 do anything that > might affect the fan? Like clobber a BIOS-installed > interrupt handler? The SMBus does have a PCI IRQ: > > 00:1f.3 SMBus: Intel Corp. 82801AA SMBus (rev 02) > Subsystem: Intel Corp. 82801AA SMBus > Control: I/O+ Mem- BusMaster- SpecCycle- > MemWINV- VGASnoop- ParErr- Step > ping- SERR- FastB2B- > Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- > DEVSEL=medium >TAbort- <TAbort > - <MAbort- >SERR- <PERR- > Interrupt: pin B routed to IRQ 17 > Region 4: I/O ports at efa0 [size=16] > > Chris > > --- phil at netroedge.com wrote: > > > > If you want to experiment, you could try to disable > > initialization in > > the lm87.c module. Edit this: > > > > /* Initialize the LM87 chip */ > > lm87_init_client(new_client); > > return 0; > > > > to: > > > > /* Initialize the LM87 chip */ > > /* lm87_init_client(new_client); */ > > return 0; > > > > Then rebuild/reinstall/whatever... > > > > And see what you get. You can also examine the > > lm87_init_client > > function if you want to see exactly what it is > > doing. > > > > Let me know what you find out! > > > > > > Phil > > > > On Thu, Jun 20, 2002 at 12:11:08AM +0100, Chris > > Rankin wrote: > > > --- phil at netroedge.com wrote: > > > > > Oh, boy, I'm not sure. It sounded like the fan > > was > > > > controlled by an > > > > LM87. What controls the LM87? It seems obvious > > to > > > > me that the LM87's > > > > must be controlled exclusively through the > > SMBus. > > > > It's possible that > > > > ACPI (or some other Bios thing?) is controlling > > the > > > > LM87 via the > > > > SMBus, but I'm not an ACPI expert. > > > > > > Just "for laughs", I rebooted without loading the > > i2c > > > modules (i2c-i801, lm87, eeprom and dependents) > > and I > > > am now hearing the sound of the thermal fan! So > > what > > > we have now is a classic catch-22 because I can no > > > longer know whether the fan is cutting in at the > > > correct temperature! > > > > > > Chris > > > > > > > > > __________________________________________________ > > > Do You Yahoo!? > > > Everything you'll ever need on one web page > > > from News and Sport to Email and Music Charts > > > http://uk.my.yahoo.com > > > > -- > > Philip Edelbrock -- IS Manager -- Edge Design, > > Corvallis, OR > > phil at netroedge.com -- > > http://www.netroedge.com/~phil > > PGP F16: 01 D2 FD 01 B5 46 F4 F0 3A 8B 9D 7E 14 7F > > FB 7A > > > __________________________________________________ > Do You Yahoo!? > Everything you'll ever need on one web page > from News and Sport to Email and Music Charts > http://uk.my.yahoo.com -- Philip Edelbrock -- IS Manager -- Edge Design, Corvallis, OR phil at netroedge.com -- http://www.netroedge.com/~phil PGP F16: 01 D2 FD 01 B5 46 F4 F0 3A 8B 9D 7E 14 7F FB 7A
