Bug 4546
| Summary: | A fix for APM on Acer Extensa 501T and possibly others. | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Michael McConachie <michael> |
| Component: | kernel | Assignee: | Michael K. Johnson <johnsonm> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 6.0 | CC: | claudiol |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2000-02-04 03:10:46 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: | |||
Doug, could you please evaluate this? Kernel problem, not apmd. Doesn't apply to current kernel - guess we can close this? This is a kernel problem - it's fixed in 2.3.x (CONFIG_APM_BAD_ENTRY_OFFSET), but it's still present in kernel 2.2.14. The patch mentioned above doesn't apply to current 2.2 kernels; the line in question is line 1353 in arch/i386/kernel/apm.c 2.2.14-1.2.0. I don't see a problem with this patch - IMO it can get in. Its already handled differently in current 2.2 |
This ended up comming in over a support ticket. The informations eems to be quite valid. Submitted as a bug in case it's any use to others... Bios of "ACER EXTENSA 501T" return apm_bios_info.cseg=0xfbbd and apm_bios_info.offset=0x500000 (this is bad adress) working is apm_bios_info.cseg=0xfbbd and apm_bios_info.offset=0 --- apm.c.orig Fri Jan 15 07:57:25 1999 +++ apm.c Mon Jun 28 14:36:29 1999 @@ -1349,7 +1349,7 @@ __va((unsigned long)0x40 << 4)); _set_limit((char *)&gdt[APM_40 >> 3], 4095 - (0x40 << 4)); - apm_bios_entry.offset = apm_bios_info.offset; + apm_bios_entry.offset = apm_bios_info.offset & 0xffff; apm_bios_entry.segment = APM_CS; set_base(gdt[APM_CS >> 3], __va((unsigned long)apm_bios_info.cseg << 4)); -- References: http://www.al.unipmn.it/~sitta/linux503.html http://www.al.unipmn.it/~sitta/linux/apm.html --michael