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[Bug 1506707] Re: [regression] Mir server command line options are unpredictable/nondeterministic (--vt is sometimes not recognised)

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>
Date: Thu, 03 Dec 2015 04:23:55 -0000
Reply-to: Bug 1506707 <1506707@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: mir
    Milestone: None => 0.18.0

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https://bugs.launchpad.net/bugs/1506707

Title:
  [regression] Mir server command line options are
  unpredictable/nondeterministic (--vt is sometimes not recognised)

Status in Mir:
  Fix Committed
Status in mir package in Ubuntu:
  New

Bug description:
  Mir server platform command line options are unpredictable/non-
  deterministic.

  I keep thinking I'm imagining things. Sometimes --vt works and
  sometimes it doesn't (from a Gnome Terminal). Well both are true. Now
  I have two separate wily machines with the same packages. One fails
  but the other works:

  FAILING MACHINE:

  $ sudo mir_proving_server --vt 1
  [1444966151.185585] mirplatform: Found graphics driver: mesa-x11
  [1444966151.187021] mirplatform: Found graphics driver: mesa-kms
  Unknown command line options: --vt 1
  $ dpkg -l | grep mir-demos
  ii  mir-demos                                     0.16.0+15.10.20150921.1-0ubuntu1           amd64        Display server for Ubuntu - demonstration programs

  WORKING MACHINE:

  $ sudo mir_proving_server --vt 1
  [1444965570.300933] mirplatform: Found graphics driver: mesa-kms
  [1444965570.302119] mirplatform: Found graphics driver: mesa-x11
  [1444965570.304409] mircommon: Loading modules from: /usr/lib/x86_64-linux-gnu/mir/server-platform
  [1444965570.304465] mircommon: Loading module: /usr/lib/x86_64-linux-gnu/mir/server-platform/graphics-mesa-kms.so.5
  [1444965570.304486] mircommon: Loading module: /usr/lib/x86_64-linux-gnu/mir/server-platform/server-mesa-x11.so.5
  [1444965570.305801] mirplatform: Found graphics driver: mesa-kms
  [1444965570.306531] mirplatform: Found graphics driver: mesa-x11
  [1444965570.306617] mirserver: Selected driver: mesa-kms (version 0.16.0)
  ...
  $ dpkg -l | grep mir-demos
  ii  mir-demos                                            0.16.0+15.10.20150921.1-0ubuntu1                      amd64        Display server for Ubuntu - demonstration programs

  It appears the unpredictability might be arising from which driver it
  finds on the filesystem first.

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