Bug 6822
| Summary: | p4-clockmod on Intel Celeron is now having only 2 states | ||
|---|---|---|---|
| Product: | Power Management | Reporter: | Cijoml Cijomlovic Cijomlov (cijoml) |
| Component: | cpufreq | Assignee: | Dave Jones (davej) |
| Status: | CLOSED PATCH_ALREADY_AVAILABLE | ||
| Severity: | high | CC: | acpi_power-processor |
| Priority: | P2 | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.16,2.6.17,2.6.18 | Subsystem: | |
| Regression: | --- | Bisected commit-id: | |
| Attachments: | Output of acpidump | ||
|
Description
Cijoml Cijomlovic Cijomlov
2006-07-12 00:07:30 UTC
notas:/home/cijoml# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies 2100000 2400000 Before we had minimum 300000 and I think 6 states Please attach output of acpidump utility and give reason why you want to use p4-clockmod... Hi, I need this, because only this modulation is available on my laptop. No throttling, nothink more :( notas:/home/cijoml# cat /proc/acpi/processor/CPU0/throttling <not supported> I think the fix is to delete p4-clockmod.c from the kernel source tree, since all it does is slow the machine down without saving any energy. (power [Watt-Hour] = energy/time [Watt]) It is not true, coz when running low speed, emitted heat is lower. In fact it prolongs battery live for about 30/45 mins, which is good! The lower frequencies were removed in later kernels as part of an errata workaround. It's possible that using them on affected CPUs can cause lockups. Hi, I have in company more than 20 laptops with this CPU from different vendors and no one ever locked for 2 years. If you want workaround somethink, which never occur, can you also provide force option to tell the kernel use all of these states? Thank you a lot Created attachment 10123 [details]
Output of acpidump
I submitted this bug report to Debian BTS: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=360773 I think that it is very similar to this one. Since 2.6.16 I'm unable to have my laptop cpu scaling working. Under a kernel <= 2.6.15 I have: alien:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_available_frequencies 333325 666650 999975 1333300 1666625 1999950 2333275 2666600 Under a kernel >= 2.6.16 I get instead alien:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_available_frequencies 2333275 2666600 It was told to me to try with the latest 2.6.19 and 2.6.20-rc kernels. I tried both of them but got the same results. My /proc/cpuinfo: processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.66GHz stepping : 9 cpu MHz : 332.072 cache size : 512 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr bogomips : 5314.32 Lspci: 00:00.0 Host bridge: Silicon Integrated Systems [SiS] 651 Host (rev 02) 00:01.0 PCI bridge: Silicon Integrated Systems [SiS] Virtual PCI-to-PCI bridge (AGP) 00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS962 [MuTIOL Media IO] (rev 14) 00:02.1 SMBus: Silicon Integrated Systems [SiS] SiS961/2 SMBus Controller 00:02.3 FireWire (IEEE 1394): Silicon Integrated Systems [SiS] FireWire Controller 00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] 00:02.6 Modem: Silicon Integrated Systems [SiS] AC'97 Modem Controller (rev a0) 00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] AC'97 Sound Controller (rev a0) 00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f) 00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f) 00:03.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f) 00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller 00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] SiS900 PCI Fast Ethernet (rev 91) 00:0a.0 CardBus bridge: ENE Technology Inc CB1410 Cardbus Controller 01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 65x/M650/740 PCI/AGP VGA Display Adapter CPU info from dmesg: CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000 00004400 000000 00 00000000 CPU: After vendor identify, caps: bfebfbff 00000000 00000000 00000000 00004400 0000000 0 00000000 CPU: Trace cache: 12K uops, L1 D cache: 8K CPU: L2 cache: 512K CPU: After all inits, caps: bfebfbff 00000000 00000000 00000080 00004400 00000000 0000 0000 Intel machine check architecture supported. Intel machine check reporting enabled on CPU#0. CPU0: Intel P4/Xeon Extended MCE MSRs (12) available CPU0: Thermal monitoring enabled mtrr: v2.0 (20020519) CPU: Intel(R) Pentium(R) 4 CPU 2.66GHz stepping 09 An acpidump is attached. Thanks Hi it is same problem as I do have. See Dave's post: ------- Additional Comment #6 From Dave Jones 2006-07-28 20:01 ------- The lower frequencies were removed in later kernels as part of an errata workaround. It's possible that using them on affected CPUs can cause lockups. Fixed in 2.6.20-rc7 |