Well, looks like the power manager tweak didn't eliminate it after all. However, I'm now starting to suspect full-screen video as a contributing factor, as my most recent "freeze" happened only after I watched a full-screen video for the first time since the power-manager tweak, and I had had inklings that full-screen video might be involved even before that tweak.
I'll try to run some more tests over the next few days...
Well, looks like the power manager tweak didn't eliminate it after all. However, I'm now starting to suspect full-screen video as a contributing factor, as my most recent "freeze" happened only after I watched a full-screen video for the first time since the power-manager tweak, and I had had inklings that full-screen video might be involved even before that tweak.
I'll try to run some more tests over the next few days...
BTW, I'm running on a Lenovo X201.