Chapter 3. Frequently Asked Questions

This section provides answers to frequently asked questions associated with the NVIDIA SunOS x86 Driver and its installation. Common problem diagnoses can be found in Chapter 4, Common Problems and tips for new users can be found in Chapter 7, Tips for New SunOS Users. Also, detailed information for specific setups is provided in the Appendices.

3.1. NVIDIA Driver

Where should I start when diagnosing display problems?

One of the most useful tools for diagnosing problems is the X log file in /var/log. Lines that begin with (II) are information, (WW) are warnings, and (EE) are errors. You should make sure that the correct config file (i.e. the config file you are editing) is being used; look for the line that begins with:

    (==) Using config file:

Also make sure that the NVIDIA driver is being used, rather than the “nv” or “vesa” driver. Search for

    (II) LoadModule: "nvidia"

Lines from the driver should begin with:

    (II) NVIDIA(0)

How can I increase the amount of data printed in the X log file?

By default, the NVIDIA X driver prints relatively few messages to stderr and the X log file. If you need to troubleshoot, then it may be helpful to enable more verbose output by using the X command line options -verbose and -logverbose, which can be used to set the verbosity level for the stderr and log file messages, respectively. The NVIDIA X driver will output more messages when the verbosity level is at or above 5 (X defaults to verbosity level 1 for stderr and level 3 for the log file). So, to enable verbose messaging from the NVIDIA X driver to the X server log file, you could start X with the verbosity level set to 5, by doing the following:

  • Become root.

  • If not done yet, copy your configuration file for the X server from /usr/dt/condig to /etc/dt/config:

    # cp /usr/dt/config/Xservers /etc/dt/config/Xservers

  • At the end of the etc/dt/config/Xservers file, add the options '-logverbose 5' to the uncommented line(s) starting with the display number. For example:

      :0   Local local_uid@console root /usr/X11/bin/Xserver :0 -nobanner -logverbose 5

  • Restart the X server

Why does X use so much memory?

When measuring any application's memory usage, you must be careful to distinguish between physical system RAM used and virtual mappings of shared resources. For example, most shared libraries exist only once in physical memory but are mapped into multiple processes. This memory should only be counted once when computing total memory usage. In the same way, the video memory on a graphics card or register memory on any device can be mapped into multiple processes. These mappings do not consume normal system RAM.

The pmap utility is available in the directory /usr/proc/bin, and is a useful tool in distinguishing between types of memory mappings. For example, while prstat may indicate that X is using several hundred MB of memory, the last line of output from pmap -x:

        total Kb  337904  335884   53320       -

reveals that X is really only using roughly 53MB of system RAM (the "anon" value).

Note, also, that X must allocate resources on behalf of X clients (the window manager, your web browser, etc); X's memory usage will increase as more clients request resources such as pixmaps, and decrease as you close X applications.

How do I uninstall the NVIDIA Solaris Graphics driver ?

Two Solaris packages comprise the NVIDIA Solaris Graphics driver files. Both Solaris packages NVDAgraphicsr and NVDAgraphics need to be uninstalled. Remove the package NVDAgraphicsr first, then the package NVDAgraphics:

# pkgrm NVDAgraphicsr NVDAgraphics

Why do applications that use DGA graphics fail?

The NVIDIA driver does not support the graphics component of the XFree86-DGA (Direct Graphics Access) extension. Applications can use the XDGASelectInput() function to acquire relative pointer motion, but graphics-related functions such as XDGASetMode() and XDGAOpenFramebuffer() will fail.

The graphics component of XFree86-DGA is not supported because it requires a CPU mapping of framebuffer memory. As graphics boards ship with increasing quantities of video memory, the NVIDIA X driver has had to switch to a more dynamic memory mapping scheme that is incompatible with DGA. Furthermore, DGA does not cooperate with other graphics rendering libraries such as Xlib and OpenGL because it accesses GPU resources directly.

It is recommended that applications use OpenGL or Xlib, rather than DGA, for graphics rendering. Using rendering libraries other than DGA will yield better performance and improve interoperability with other X applications.

My kernel log contains messages that are prefixed with "Xid"; what do these messages mean?

"Xid" messages indicate that a general GPU error occurred, most often due to the driver misprogramming the GPU or to corruption of the commands sent to the GPU. These messages provide diagnostic information that can be used by NVIDIA to aid in debugging reported problems.

On what NVIDIA hardware is the EXT_framebuffer_object OpenGL extension supported?

EXT_framebuffer_object is supported on GeForce FX, Quadro FX, and newer GPUs.

I use the Coolbits overclocking interface to adjust my graphics card's clock frequencies, but the defaults are reset whenever X is restarted. How do I make my changes persistent?

Clock frequency settings are not saved/restored automatically by default to avoid potential stability and other problems that may be encountered if the chosen frequency settings differ from the defaults qualified by the manufacturer. You can use the command line below in ~/.xinitrc to automatically apply custom clock frequency settings when the X server is started:

    # nvidia-settings -a GPUOverclockingState=1 -a GPU2DClockFreqs=<GPU>,<MEM> -a GPU3DClockFreqs=<GPU>,<MEM>

Here <GPU> and <MEM> are the desired GPU and video memory frequencies (in MHz), respectively.

Why is the refresh rate not reported correctly by utilities that use the XRandR X extension (e.g., the GNOME "Screen Resolution Preferences" panel, `xrandr -q`, etc)?

The XRandR X extension is not presently aware of multiple display devices on a single X screen; it only sees the MetaMode bounding box, which may contain one or more actual modes. This means that if multiple MetaModes have the same bounding box, XRandR will not be able to distinguish between them.

In order to support DynamicTwinView, the NVIDIA X driver must make each MetaMode appear to be unique to XRandR. Presently, the NVIDIA X driver accomplishes this by using the refresh rate as a unique identifier.

You can use `nvidia-settings -q RefreshRate` to query the actual refresh rate on each display device.

This behavior can be disabled by setting the X configuration option "DynamicTwinView" to FALSE.

For details, see Appendix G, Configuring TwinView.