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[Alberts Muktupāvels <1251281@xxxxxxxxxxxxxxxxxx>]

Has anyone tried speak about this with upstream?

Did not check Eugene's patch, but my idea is simple. Just add extra
command line option to allow disable acceleration check. If it is set,
than check should not be made. For example --disable-acceleration-check.
Than sessions who need it could add that in .desktop file: gnome-session
--session=gnome-flashback --disable-acceleration-check

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https://bugs.launchpad.net/bugs/1251281

Title:
  gnome-flashback (metacity) fails to start without hardware
  acceleration, cloud/remote environments
  (Forwarded-X/XRDP/VNC/NX/X2GO/Chromoting)

Status in “gnome-session” package in Ubuntu:
  In Progress

Bug description:
  When trying to launch gnome-flashback (metacity) session from
  XRDP/VNC/NX/X2GO/Chromoting it fails with diagnostics in log:

  >gnome-session-is-accelerated: No composite extension.
  >gnome-session-check-accelerated: Helper exited with code 256
  >gnome-session-is-accelerated: No composite extension.
  >gnome-session-check-accelerated: Helper exited with code 256
  >** (process:11622): WARNING **: software acceleration check failed: Child process exited with code 1

  When starting manually gnome-panel, metacity, nautilus and other
  components from .xsession - it works normally.

  Looks like - unnecessary check performed (and failed).

  This breaks gnome-flashback, breaking upgrade path from previous LTS
  and removing most sane option for cloud environments!

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