Red Hat Bugzilla – Bug 284191
The kernel-2.6.22.4-45.fc6 package breaks the RTC.
Last modified: 2007-11-30 17:12:15 EST
Description of problem: The kernel-2.6.22.4-45.fc6 package breaks the RTC. /proc/sys/dev/rtc/max-user-freq is not found. sysctl -w dev.rtc.max-user-freq=1024 gives a "no such key" error message. Version-Release number of selected component (if applicable): How reproducible: At will. Steps to Reproduce: 1. Boot the kernel-2.6.22.4-45.fc6 kernel 2. use either echo 1024 > /proc/sys/dev/rtc/max-user-freq or sysctl -w dev.rtc.max-user-freq=1024 3. Actual results: /proc/sys/dev/rtc is not found. sysctl reports no such key. Expected results: It should quietly succeed. Additional info: The contents of the directories /lib/modules/2.6.20-1.2948.fc6/kernel/drivers/rtc and /lib/modules/2.6.22.4-45.fc6/kernel/drivers/rtc are different. In particular, /lib/modules/2.6.20-1.2948.fc6/kernel/drivers/rtc/rtc-core.ko /lib/modules/2.6.20-1.2948.fc6/kernel/drivers/rtc/rtc-dev.ko are missing from the /lib/modules/2.6.22.4-45.fc6/kernel/drivers/rtc. mplayer reports that 1024 should be poked into /proc/sys/dev/rtc but that pseudo file is missing.
This also creates issues for qemu: Program output: Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal error, but for better emulation accuracy either use a 2.6 host Linux kernel or type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root. Except that you can't set the RTC frequency due to this problem. Kernel: 2.6.22.5-49.fc6 for i686
Reverted to the old RTC driver in kernel 2.6.22.9-61.fc6. It will be in the updates-testing repository soon.