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I've installed Ubuntu 15.04 on a new Dell XPS-13 9343 (the 2015 model).
It has a i7-5600U CPU and an Intel HD 5500 integrated graphics card.
On Unity, suspend/resume appears to work fine. However, with the i3
window manager, it resumes to severe graphics corruption and all text
gone from terminals (which also become unresponsive). I can kill i3
using my normal quit key combination, which takes me to an unresponsive
and blank purple lightdm login. There are no log messages out of the
ordinary. The same issue appears if I use Fluxbox or another
"lightweight" WM, but not if I use Unity or GNOME.
If I configure X.org to use UXA acceleration rather than SNA, however,
suspend/resume works fine on the affected WMs. (This is why I believe
the X server for Intel cards is the culprit).
To reproduce: On an XPS-13 (and probably other HD 5500-based machines),
start an i3 session and run `pm-suspend`. Resuming the machine should
produce the error.
** Affects: xorg (Ubuntu)
Importance: Low
Status: Incomplete
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Suspend/resume fails with SNA acceleration on some WMs
https://bugs.launchpad.net/bugs/1437807
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