RE: XPS 15Z(L511z) sleep-mode problem after Windows 8 upgrade
and you figured how to solve it somehow?
after some time i understood when it occures. if i let the laptop on sleep in battery mode, some kind of counter starts. after 1 or 2 hours it wakes up by itself and hibernate to save power. this process causes the sleep mode problem we experience, but only the first time after this process is repetead.
my solution is to put the laptop always in hibernate or to shutdown it instead of sleep mode.
if you have a software solution please share it