I'm also having the same problem on my lenovo desktop. If I leave the screensaver running for a few hours (2 or 3), everything works fine, but when I leave it overnight, the next day when I try to unlock it, it takes my password and only displays an empty background (i.e. I can see the background image, but no window is available; the mouse still moves, but the keyboard is unresponsive).
My graphic card is an Intel 82Q35 Express Integrated Graphics Controller, please see the attached file for the output of `lspci -vvnn`.
I'm also having the same problem on my lenovo desktop. If I leave the screensaver running for a few hours (2 or 3), everything works fine, but when I leave it overnight, the next day when I try to unlock it, it takes my password and only displays an empty background (i.e. I can see the background image, but no window is available; the mouse still moves, but the keyboard is unresponsive).
My graphic card is an Intel 82Q35 Express Integrated Graphics Controller, please see the attached file for the output of `lspci -vvnn`.