Bug 198349
| Summary: | Throttling states for Pentium 4 not fully operational | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Ronny Fischer <ronny.fischer> |
| Component: | kernel | Assignee: | Dave Jones <davej> |
| Status: | CLOSED NOTABUG | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 5 | CC: | pfrields, wtogami |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i686 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2006-07-26 03:00:49 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Some steppings of the P4 have an errata which makes it risky to use the lower states. Later kernels respect this. |
Description of problem: The module "p4-clockmode" provides only two different throttling speed states (100% and 87%) so that the Pentium 4 is nearly always at high speed. The same module at FC4 provided all eight different throttling states. Version-Release number of selected component (if applicable): Fedora Core 5, Kernel 2.6.17-1-2145_FC5, Intel 875PZLK Mainboard with latest BIOS, Pentium 4 2.6 GHz, HT disabled (with HT enabled it's the same) How reproducible: Always Steps to Reproduce: 1. Install FC5 on a Pentium 4 system 2. Make the module "p4-clockmod" work 3. Actual results: Only two out of eight throttling states work Expected results: the module should provide more throttling states Additional info: Everything else of power-saving features works correct (suspend, standby) "cat /proc/acpi/processor/CPU1/throttling" says state count: 8 active state: T0 states: *T0: 00% T1: 12% T2: 25% T3: 37% T4: 50% T5: 62% T6: 75% T7: 87% so that more states possible.