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[Markus Kohli <ubone@xxxxxxxxx>]

After some further testing I've been able to save the following from
dmesg after resume:

[ 2195.742519] Modules linked in: nvram msr binfmt_misc rfcomm bnep nls_iso8859_1 uvcvideo videobuf2_vmalloc btusb videobuf2_memops videobuf2_core bluetooth v4l2_common videodev usbhid media snd_hda_codec_hdmi joydev intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp dell_wmi sparse_keymap hid_multitouch dell_laptop dcdbas kvm_intel kvm wl(POE) crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_realtek snd_hda_codec_generic aesni_intel aes_x86_64 snd_soc_rt286 lrw gf128mul snd_hda_intel glue_helper snd_soc_core ablk_helper snd_hda_controller cryptd serio_raw i915 snd_compress snd_hda_codec cfg80211 snd_hwdep snd_pcm_dmaengine snd_pcm drm_kms_helper rtsx_pci_ms memstick drm mei_me lpc_ich shpchp i2c_algo_bit mei snd_seq_midi wmi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device
[ 2195.743030] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.752692] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.758322] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.758469] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.762139] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.767627] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.777799] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.777857] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.777952] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.777962] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2195.777974] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 2242.113327] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Restarting X doesn't help, display remains unusable.

-- 
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Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1437807

Title:
  Suspend/resume fails with SNA acceleration on some WMs

Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  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.

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