Eric, Do you hear this noise for both AC and battery modes? Do you still get this noise when you run with HZ=100 or HZ=1000? Are there any T43 users who do not hear this noise? Turning off C3 is a pretty big hammer... thanks, -Len >-----Original Message----- >From: Eric Shattow [mailto:shadow@xxxxxxxxxxxxx] >Sent: Thursday, September 21, 2006 1:37 PM >To: Brown, Len >Subject: [PATCH 2.6.18 1/1] ACPI: limit cstate on noisy >thinkpad t43/p models > >IBM T43/p laptops exhibit a high pitched noise at higher ACPI >C-states. Making >C3 the max state reduces this noise greatly. > >diff -uprN linux-2.6.18/drivers/acpi/processor_idle.c >linux-2.6.18~ibm_t43p_limit_max_cstate/drivers/acpi/processor_idle.c >--- linux-2.6.18/drivers/acpi/processor_idle.c 2006-09-19 >22:42:06.000000000 -0500 >+++ >linux-2.6.18~ibm_t43p_limit_max_cstate/drivers/acpi/processor_idle.c >2006-09-21 12:20:59.000000000 -0500 >@@ -78,6 +78,9 @@ module_param(bm_history, uint, 0644); > * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3. > * For now disable this. Probably a bug somewhere else. > * >+ * IBM ThinkPad T43/p exhibits strange CPU noises at higher wait >+ * states. Forcing a wait state of C3 or less keeps things quiet. >+ * > * To skip this limit, boot/load with a large max_cstate limit. > */ > static int set_max_cstate(struct dmi_system_id *id) >@@ -145,6 +148,48 @@ static struct dmi_system_id __cpuinitdat > { set_max_cstate, "IBM ThinkPad R40e", { > DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), > DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET37WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET38WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET39WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET41WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET42WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET43WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET45WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET46WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET47WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET56WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET57WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET58WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET59WW") }, (void*)3}, >+ { set_max_cstate, "IBM ThinkPad T43/p", { >+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"), >+ DMI_MATCH(DMI_BIOS_VERSION,"1YET60WW") }, (void*)3}, > { set_max_cstate, "Medion 41700", { > DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), > DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1}, > >Signed-off by: Eric J Shattow <shadow@xxxxxxxxxxxxx> > > > >------------------------------------------------------------------ > This email was checked by AMaViS anti-virus system ! > Get yourself a free email address at http://mail.serverart.org > - 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
