Screen remains blank after waking up from screensaver

[fstolze]

Ubuntu 11.04. Issue did not occur for 10.10 and earlier versions.

Occasionally, after waking up from screensaver, the screen remains black. The mouse cursor is visible and can be moved around, it will even change where a text input box might be, but the screen does not get rendered. I can switch back and forth to text consoles, but can't seem to get the GUI back without killing X.

Repeatedly happens for me on two machines:
- Dell Studio 1558
- HP Pavillion p6367c

Attached the apport file for the HP.

[fstolze (frank-stolze)]

Added apport log for the Dell as well.

[RedSingularity (redsingularity)]

What video card driver do you have in use?

HINT: If you do 'lspci -v' in a terminal, the info will be listed under the line 'VGA compatible controller'.
---
Ubuntu Bug Squad volunteer triager
http://wiki.ubuntu.com/BugSquad

[fstolze (frank-stolze)]

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

[RedSingularity (redsingularity)]

Assigning package. The xorg team may move it somewhere more specific if they feel necessary.
---
Ubuntu Bug Squad volunteer triager
http://wiki.ubuntu.com/BugSquad

[Chris Wilson (ickle)]

DPMS vs pageflip vs modeset race.