Same issue on Lenovo T61 with Lubuntu 16.04 (after lock screen or suspend)
Intel GM965/GL960 Integrated Graphics Controller
ctlr-alt-f6 -> ctrl-alt-f7 solves problem too
Same issue on Lenovo T61 with Lubuntu 16.04 (after lock screen or suspend)
Intel GM965/GL960 Integrated Graphics Controller
ctlr-alt-f6 -> ctrl-alt-f7 solves problem too