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POWindows 7 64bit, Qt 4: glGetVersion returns "1.1.0", nvogl32v.dll gets unloaded
 

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  1. POWindows 7 64bit, Qt 4: glGetVersion returns "1.1.0", nvogl32v.dll gets unloaded
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    <p><strong>situation</strong></p> <p>I'm developing 32bit application that uses Qt 4, and I"m working on Windows 7 64bit.</p> <p>My program has main non-OpenGL widget, and QGLWidget which is optionally opened by the user.</p> <p><strong>problem:</strong></p> <p>When I create that <code>QGLWidget</code>, <code>glGetVersion</code> reports "1.1.0" (my hardware supports OpenGL 4.3.0). As a result many functions I need do not work at all (obviosuly, because they are not available in OpenGL 1). This problem happens "sometimes". </p> <p><strong>additional info</strong></p> <p>IF I launch program using gDebugger everything works fine, and glGetVersion returns "4.3.0", as expected. Adding this line:</p> <pre><code>QGLFormat::OpenGLVersionFlags flags = QGLFormat::openGLVersionFlags(); </code></pre> <p>at the beginning of main() function also fixes the problem.</p> <p>The application works fine on WinXP 32bit. </p> <p>I wrote OpenGL subsystem for this app 2..3 years ago and the guys who used it said they had similar problem on virtual machines (Win7 or vista guest), but I don't remember how I dealt with this problem at that time.</p> <p><strong>OpenGL initialization</strong></p> <p><em>OpenGL initialization is performed by Qt 4</em>, without glew or extra libraries, using QGLWidget.</p> <p>There's only one QGLWidget in the program. To be precise, there's a class derived from QGLWidget, its initalization looks like this:</p> <pre><code>DisplayWidget::DisplayWidget(QWidget* parent) : QGLWidget(QGLFormat(QGL::DoubleBuffer | QGL::DepthBuffer), parent) </code></pre> <p><strong>System configuration</strong>:<br> OS: Windows 7 64bit.<br> Compiler: MSVC2008 express SP1.<br> Qt: Qt 4.8.1 (compiled from source with OpenSSL support using MSVC2008). Windows SDK: Windows Server 2008 and .NET 3.5. GPU: GeForce 460 GTX</p> <p><strong>question</strong>:</p> <p>What could be causing this problem?</p> <p>--update--</p> <p>"magical fix" (OpenGLVersionFlags) has stopped working after full rebuild, and now application constantly initializes software renderer, even when launched using gDebugger. </p> <p>All other OpenGL applications on my machine work fine and can use shaders.</p> <p>I use latest drivers.</p> <p>Any ideas?</p> <p>--update--</p> <p>After some testing I found that somehow google chrome and steam client affect all Qt application that use OpenGL.</p> <p>If I have Google Chrome and Steam open, eventually all programs will stop working properly and will no longer be able to get hardware accelerated OpenGL.</p> <p>If I close google chrome and keep steam open, every 2nd attempt to launch hardware accelerated program will fail. </p> <p>If I close both steam and chrome, then every program launch will be successful. </p> <p>Why could this be happening? </p> <p>--update--</p> <p>I've read through debugger output, and found a very interesting thing:</p> <pre><code>'vdclient.exe': Loaded 'C:\Windows\SysWOW64\nvoglv32.dll' First-chance exception at 0x777f47a5 (ntdll.dll) in vdclient.exe: 0xC0000005: Access violation reading location 0x05aa9000. 'vdclient.exe': Unloaded 'C:\Windows\SysWOW64\nvoglv32.dll' </code></pre> <p>Basically, when loading nvoglv32.dll, "something" crahses somewhere (debugger doesn't react to this event, byt the way), and system decides to unload nvoglv32.dll. Judging by its name it is nvidia system/driver component, and without this component there can be no hardware acceleration. </p> <p>When opengl works properly, this part of log looks like this:</p> <pre><code>'vdclient.exe': Loaded 'C:\Windows\SysWOW64\nvoglv32.dll' 'vdclient.exe': Loaded 'C:\Windows\SysWOW64\ntmarta.dll', Symbols loaded (source information stripped). 'vdclient.exe': Loaded 'C:\Windows\SysWOW64\Wldap32.dll', Symbols loaded (source information stripped). 'vdclient.exe': Loaded 'C:\Windows\SysWOW64\powrprof.dll', Symbols loaded (source information stripped). The thread 'Win32 Thread' (0x1744) has exited with code 0 (0x0). The thread 'Win32 Thread' (0x1740) has exited with code 0 (0x0). 'vdclient.exe': Unloaded 'C:\Windows\SysWOW64\powrprof.dll' The thread 'Win32 Thread' (0x1748) has exited with code 0 (0x0). The thread 'Win32 Thread' (0x174c) has exited with code 0 (0x0). 'vdclient.exe': Loaded 'C:\Windows\SysWOW64\uxtheme.dll', Symbols loaded (source information stripped). </code></pre> <p>Ideas?</p>
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    1. CO"*This problem happens "sometimes".*" What does *that* mean? Can you nail down something particular that causes it? What are your pixel format parameters?
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    2. CO@NicolBolas: Sometimes when I start app, it reports gl version 4.3.0. However, in most cases when I start it normally (and without mentioned "magical QGLFormat fix"), gl version reports "1.1.0".
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    3. COGPU driver version? Did you try to reinstall the drivers? I suggest you fetch the latest release from NVidia and install that to rule out any driver bugs.
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      1. USdatenwolf
 

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