System freezes whilst powernowd stepping up AMD64 freq (intermittent/hoary)
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux-source-2.6.15 (Ubuntu) |
Fix Released
|
Medium
|
Ben Collins |
Bug Description
Running Kubuntu/Hoary on Amd64-2800 CPU. Switched to k8 (from generic) kernel
shortly after installation. Running both "ksensors" (to monitor CPU freq) and KDE
panel applet "System Monitor" (to monitor CPU/memory utilization). AMD64 runs at
1000MHz at low end, and 1800MHz at high end.
Once in a couple of hours to couple of days, system hard freezes with these
symptoms:
1. ksensors shows that CPU is at 1000MHz
2. System Monitor shows that CPU is 100% (or so) utilized.
This is a transient condition, which means that the CPU is about to jump up to
1800MHz, so I assume that freeze occurs during powernowd trying to step up CPU freq.
Disabled /etc/init.
This is stock Kubuntu 5.04 except k8 kernel instead of the shipped generic one. I
have not experienced a freeze in generic kernel, but then I had run it only for a
day or so, before installing k8 kernel. /proc/cpuinfo follows:
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 12
model name : AMD Athlon(tm) 64 Processor 2800+
stepping : 0
cpu MHz : 1800.125
cache size : 512 KB
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pa
t pse36 clflush mmx fxsr sse sse2 pni syscall nx mmxext lm 3dnowext 3dnow
bogomips : 3530.75
TLB size : 1088 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp
I've been running amd64-generic kernel for more than a week now, and not a single freeze so far.
So I can confirm that this is related to k8 kernel. Version info follows:
linux-amd64-k8 2.6.10-7
linux-amd64-generic 2.6.10-7
powernowd 0.90-3ubuntu14