i915 on both systems. Also - disabling power management circumvents this issue. So the bug appears to be related to power management with the i915 driver.
Dell Studio 1558: 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 12) (prog-if 00 [VGA controller]) Subsystem: Dell Device 0413 Flags: bus master, fast devsel, latency 0, IRQ 43 Memory at f0000000 (64-bit, non-prefetchable) [size=4M] Memory at d0000000 (64-bit, prefetchable) [size=256M] I/O ports at 1800 [size=8] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915 HP Pavillion p6367c: 00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device 2a94 Flags: bus master, fast devsel, latency 0, IRQ 43 Memory at fe400000 (64-bit, non-prefetchable) [size=4M] Memory at e0000000 (64-bit, prefetchable) [size=256M] I/O ports at cc00 [size=8] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/785841 Title: Screen remains blank after waking up from screensaver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/785841/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs