Z61m freezes from battery to power switch

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daniel123 · #1 Post by **daniel123** » Mon Nov 13, 2006 10:56 am

I have a brand new Z61m and it freezes quite often: if I remove the power plug to work on battery, everything is fine; if I then plug the power back in, the laptop occasionally freezes - only way to recover is to hard reboot it. I already updated to the latest drivers through the Thinkpad Productivity Center. Any idea how this can be fixed?

Thanks for your help!

Daniel

PS: I have a work around, but it is ugly - if I put the laptop to standby, before plug the power back in, and then wake it up with the power cable plugged in, it works fine. Obviously this is not ideal at all, as you don't want to put your machine into standby every time you are plug the power back in.

agarza · #2 Post by **agarza** » Mon Nov 13, 2006 1:30 pm

This also happens something to my T41p, dunno why though

barrywohl · #3 Post by **barrywohl** » Tue Mar 06, 2007 3:26 pm

I'm having the same problem and it is mission critical! I carry a laptop with me in and out of exam rooms all day. I plug in when I can. I have had no problem with this in 3 years with a half dozen R51 and R50p ThinkPads.

My otherwise wonderful Z61p freezes up when I plug in an ac adaptor sometimes. I haven't figured out the pattern but I'm working on it.

I've updated power management drivers, bios, and altered the Catalyst driver from default, and it still happens.

The Standby workaround is a possibility. I'm hoping there's a software solution. I'll send it back in when it gets consistent, but it is too infrequent. I'm hoping somebody has really doped this out.

Barry in Wyoming. ThinkPads since 1995
755cx, 760ED, A21p, R50p, Z61p

gotconsultants · #4 Post by **gotconsultants** » Wed Mar 07, 2007 1:01 pm

Contact Lenovo technical support if you still have a support contract on your notebook...

barrywohl · #5 Post by **barrywohl** » Sun Mar 11, 2007 10:17 am

See this thread.

I've convinced myself it is a planar board or similar hardware problem, as I can demonstrate the problem with no hard drive installed, booting to the BIOS setup utility. I have tried to see if I can generate the problem with either of my two DIMMs installed and I can.

I have not tried a BIOS/Embedded Controller roll back. Right now I'm running 2.14 /1.08 versions. My system came with 2.09.

Z61m freezes from battery to power switch

Z61m freezes from battery to power switch

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