Red Hat Bugzilla – Bug 103624
Change compile-time option CONFIG_APM_RTS_IS_GMT to sysctl-tunable kernel parameter
Last modified: 2007-04-18 12:57:20 EDT
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Description of problem:
The fact that CONFIG_APM_RTS_IS_GMT is a kernel compile-time flag instead of a
sysctl-tunable parameter (and companies like RedHat deliver kernels compiled
with this flag on) means that you have to recompile the kernel just to be able
to run Linux in environments where the RTC _cannot_ be set to GMT (like when
co-existing with Windows operating systems). Once set up, the kernel parameter
could be set according to /etc/sysconfig/clock setting at boot time, simplifying
life for all. A quick browse of the apm.c source code makes me think this change
would not really require major work, but of course I could be mistaken.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Run standard RedHat-distributed kernel on a laptop w/external display
2. Select "RTC is _not_ UTC" in installation
3. Switch displays via FN/F8 apm call
Actual Results: The system clock was off by the amount of difference from UT,
in my case, three hours.
Expected Results: Real time clock should not change when changing displays.
The problem can of course be circumvented by recompiling a new kernel with a
different CONFIG_APM_RTS_IS_GMT setting, but this seems like a rather heavy
solution for a annoyance-type problem.
Hardware Environment: Dell Latitude C600 laptop + external display
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