hang after modifying cpufreq/* after suspend/resume on amd x2/690g
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
machine:
amd x2 b3-2350 (low power, 45w), ati x1250, asus m2a-vm hdmi, 4g
i can suspend and resume, with two problems:
1. the virtual terminals are garbled after a resume
2. writing to any of the files in /sys/devices/
i've tested this two ways. normally i use fglrx (restricted module) and X. in this case, the vt's are garbled but X works fine. to verify that fglrx wasn't part of the problem i booted with init=/bin/bash and set up the network (leaving fglrx unloaded, ie no X). in this case the vt's weren't garbled, but the monitor complained about "bad frequency" so i turned it off and ssh'd in.
in both methods, the suspend/resume succeeded (other than the vt issue) but as soon as the cpufreq files are changed, the machine crashes - can't ping, no ctrl-alt-delete, no sysrq, keyboard led's don't change, ...
i'd like to try manually rmmodding powernow_k8 before the sleep/resume cycle (i've tried setting it in acpi-support) but as soon as i load the k8 module, i'm unable to unload it - anyone know how to tell what is using it, or what device it creates (so i can find it in lsof) ?