Lockups with ondemand governor

[PeteMo]

Hi all,

I recently got the VM Optimus Slider (LG-VM701) and noticed poor battery life. I have rooted the phone and, on the advice of other threads here, changed the CPU governor from performance to ondemand.
* http://forums.androidcentral.com/vi...lider/133136-default-gov-set-performance.html
* http://forums.androidcentral.com/virgin-mobile-optimus-slider/130112-os-battery-life-issues.html
* http://forums.androidcentral.com/virgin-mobile-optimus-slider/139353-battery-life-horrid.html

I have not installed any alternative kernels or ROMs and would prefer to stay as close to stock as possible at this time. I'm using No-frills CPU control to set the governor. While I have seen an appreciable increase in battery life, I have had the phone lock up several times. It has never locked up using the stock performance governor. The lock ups seem to happen most often (but not only) when waking the display. The screen goes black, but the backlight on the physical buttons at the bottom of the screen stay lit and I have to pull the battery to reboot. I have tried upping the low CPU frequency limit from 98 MHz to 196 MHz but still get lock ups.

If it would be helpful I can try to get logcat output after a lockup. I'd very much like to use the ondemand governor, if the phone would remain stable. Has anyone else had similar problems with the ondemand governor? Anyone using it without lockups? Thanks for any suggestions or ideas!

 

[economichitman]

Try flashing a clean install of the stock rom-
http://forums.androidcentral.com/vi...-rom-stock-untouched-unrooted-slider-rom.html

Wipe everything in the recovery; boot system cache data dalvik cache, before flashing. Then, with the fresh install, dont bother rooting, just install superuser to change the governor to ondemand.

 

[PeteMo]

I'm not clear why a clean install of the stock ROM is necessary. The phone is less than two weeks old and not heavily modified.

Today I experimented with enabling the ondemand governor but setting the low frequency to 480 MHz. The phone was stable, but the battery life was worse than with the performance governor. My plan is to continue to lower the low frequency and observe battery life.

I'm interested in hearing from anyone who is running the ondemand governor on this phone. What frequencies, and how stable is the phone?

 

[economichitman]

I have my gf's slider set to 196/800 ondemand with 96/480 conservative screen-off, and 800 performance in-call profiles. Completely stable, on the stock rom. You could just try wiping cache and dalvik in your recovery. Sometimes android just becomes unstable after the right combination of apps are installed.

I played around with gelato and gingerkernel, and those made the phone unstable. I'd avoid both.

You may also have a bad phone. Flawed cpu's tend to lock up when changing frequencies rapidly, which would explain why locking it at 800 seems to fix it. When the screen turns on, the cpu is jumping from the minimum to the max, and any instability becomes obvious.

 

[PeteMo]

I cleared the cache and dalvik cache and have been running for over 24 hours now with the ondemand governor 96/800 and no lockups. I did notice the phone was very unresponsive for 5-10 seconds after turning on the screen, so I've set up the profiles as mentioned above.

I'll monitor behavior and battery life for the next day or two and see how things go.