X2Go Bug report logs - #330
Incorrect detection of color depth on Windows

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Package: python-x2go; Maintainer for python-x2go is X2Go Developers <x2go-dev@lists.x2go.org>; Source for python-x2go is src:python-x2go.

Reported by: kenneth <kenneth@wangpedersen.com>

Date: Tue, 22 Oct 2013 05:33:01 UTC

Severity: normal

Tags: patch, pending

Found in version

Fixed in version

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

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From: owner@bugs.x2go.org (X2Go Bug Tracking System)
Subject: Bug#330 closed by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
 (X2Go issue (in src:python-x2go) has been marked as closed)
Message-ID: <handler.330.c.138919143130438.notifdone@bugs.x2go.org>
References: <20140108142934.7AD6F5DCD9@ymir>
X-X2go-PR-Keywords: pending patch
X-X2go-PR-Message: they-closed 330
X-X2go-PR-Package: python-x2go
X-X2go-PR-Source: python-x2go
Date: Wed, 08 Jan 2014 14:35:03 +0000
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[Message part 1 (text/plain, inline)]
This is an automatic notification regarding your Bug report
which was filed against the python-x2go package:

#330: Incorrect detection of color depth on Windows

It has been closed by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Mike Gabriel <mike.gabriel@das-netzwerkteam.de> by
replying to this email.

X2Go Bug Tracking System
Contact owner@bugs.x2go.org with problems
[Message part 2 (message/rfc822, inline)]
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: 330-submitter@bugs.x2go.org
Cc: control@bugs.x2go.org, 330@bugs.x2go.org
Subject: X2Go issue (in src:python-x2go) has been marked as closed
Date: Wed, 8 Jan 2014 15:29:34 +0100 (CET)
close #330


we are very hopeful that X2Go issue #330 reported by you
has been resolved in the new release ( of the
X2Go source project »src:python-x2go«.

You can view the complete changelog entry of src:python-x2go (
below, and you can use the following link to view all the code changes
between this and the last release of src:python-x2go.


If you feel that the issue has not been resolved satisfyingly, feel
free to reopen this bug report or submit a follow-up report with
further observations described based on the new released version
of src:python-x2go.

Thanks a lot for contributing to X2Go!!!

X2Go Git Admin (on behalf of the sender of this mail)

X2Go Component: src:python-x2go
Date: Wed, 08 Jan 2014 15:14:16 +0100
Fixes: 329 330 335
 python-x2go ( RELEASED; urgency=low
   [ Mike Gabriel ]
   * New upstream version (
     - Agent channels in Paramiko can raise an EOFError if the connection
       has got disrupted. Ignoring this.
     - Store the session password in base64 encoded string in order to make
       it harder spotting the long term stored (for the duration of the session)
       plain text password.
     - Support encryption passphrases on SSH private key files (X2Go SSH
       connections as well as SSH proxy connections).
     - Invalidate SSH private keys (filename, pkey object) when look_for_keys is
     - Keep private key information even if force_password_auth is set in the
       control session's connect() method.
     - Fix parameter handling in X2GoSession.connect().
     - Rewrite passwords that are not string/unicode to an empty string.
     - No Unicode chars in log messages. Eliminated one more in checkhosts.py.
     - Implement two-factor authentication.
     - Compat fix in _paramiko monkey patch module to also work with early
       Paramiko versions.
     - Handle echoing ~/.*shrc files gracefully via SSH client connections. Do
       not allow data injections via ~/.*shrc files. (Fixes: #335).
     - Properly handle (=expand) the "~" character in key filenames. (Brought to
       attention by Eldamir on IRC. Thanks!).
     - Differentiate between desktop sharing errors and desktop sharing access
       that gets denied by the other/remote user.
     - Report about found session window / session window retitling in debug
     - Fix session window detection when local session manager is the i3 session
       manager (which uses _NET_CLIENT_LIST_STACKING instead of
     - Check for pulse cookie file in old (~/.pulse-cookie) and new
       (~/.config/pulse/cookie) location.
     - Import python-x2go-py3.patch from Fedora. Thanks to Orion!!!
     - Improve setup.py script: make it run with Python3 and older Python2
     - Fix tests for two-factor authentication in control session and SSH proxy
     - Fix regression: Make password logins with PyHoca-CLI succeed again.
     - Make channel compression to all authentication methods.
     - Set keepalive on proxy channel.
     - Only use [<host>]:<port> if <port> is not 22.
     - Handle host key checks for hosts that do not have a port specified.
   * debian/source/format:
     + Switch to format 1.0.
   * python-x2go.spec:
     + Ship python-x2go.spec (RPM package definitions) in upstream project.
       (Thanks to the Fedora package maintainers).
     + Clear (Fedora package) changelog.
     + Drop dependency on python-cups.
   [ Orion Poplawski ]
   * debian/control:
     + Drop python-cups from Depends: field. Python CUPS is no dependency if
       Python X2Go. (Fixes: #329).
   [ Kenneth Pedersen ]
   * New upstream version (
     - Color depth detection: Stop using win32api.GetSystemMetrics(2) which actually
       returns the width of a vertical scroll bar in pixels. Instead, create a screen
       display context and query it for the color depth. (Fixes: #330).

[Message part 3 (message/rfc822, inline)]
From: kenneth <kenneth@wangpedersen.com>
To: <submit@bugs.x2go.org>
Subject: Incorrect detection of color depth on Windows
Date: Mon, 21 Oct 2013 22:13:44 -0700
Package: python-x2go
Tags: patch

The following code is used when detecting color depth on Windows (in x2go/utils.py):

  return win32api.GetSystemMetrics(2)

The following constant actually has the numeric value 2: 
SM_CXVSCROLL - The width of a vertical scroll bar, in pixels. 
See e.g. http://msdn.microsoft.com/en-us/library/windows/desktop/ms724385(v=vs.85).aspx

At least on my system (Windows 7), this value is 17, causing python-x2go to incorrectly identify the display
as having 17 bits-per-pixel.

The attached patch fixes this issue by creating a screen display context and querying it for the color depth.

Kenneth Pedersen

From aba9e380f1a26299042a7f075217c9ad99505f73 Mon Sep 17 00:00:00 2001
From: Kenneth Pedersen <kenneth@wangpedersen.com>
Date: Mon, 21 Oct 2013 22:07:53 +0200
Subject: [PATCH] Detect color depth correctly on Windows

 x2go/utils.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/x2go/utils.py b/x2go/utils.py
index e8d80bc..8ecbf2c 100644
--- a/x2go/utils.py
+++ b/x2go/utils.py
@@ -48,6 +48,8 @@ if _X2GOCLIENT_OS != 'Windows':
 if _X2GOCLIENT_OS == 'Windows':
     import win32api
     import win32gui
+    import win32print
+    import win32con
 def is_in_nx3packmethods(method):
@@ -555,8 +557,10 @@ def local_color_depth():
             return 24
-        return win32api.GetSystemMetrics(2)
+        # This gets the color depth of the primary monitor. All monitors need not have the same color depth.
+        dc = win32gui.GetDC(None)
+        _depth = win32print.GetDeviceCaps(dc, win32con.BITSPIXEL) * win32print.GetDeviceCaps(dc, win32con.PLANES)
+        win32gui.ReleaseDC(None, dc)
 def is_color_depth_ok(depth_session, depth_local):

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