Bug 284191

Summary:	The kernel-2.6.22.4-45.fc6 package breaks the RTC.
Product:	[Fedora] Fedora	Reporter:	Jeff Silverman <jeffsilverm>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	high
Version:	6
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:	2.6.22.9-61.fc6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-10-08 21:41:53 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:

Description Jeff Silverman 2007-09-10 00:29:46 UTC

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.

Comment 1 Owen Berry 2007-09-17 20:34:40 UTC

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

Comment 2 Chuck Ebbert 2007-09-28 17:27:59 UTC

Reverted to the old RTC driver in kernel 2.6.22.9-61.fc6. It will be in the
updates-testing repository soon.