# Dealing With Display Problems

## On Startup

Ren'Py requires that your computer has functioning graphics acceleration hardware, such as a GPU or a CPU with integrated graphics. Ren'Py will automatically choose between the following renderers, in order.

These are the classic renderers that were used from Ren'Py 6.13 to Ren'Py 7.4. These may not be available in 7.4 and later games that require model-based rendering, and were removed entirely in Ren'Py 8.4.

1. gl: OpenGL 2.0 or greater.

2. angle: Windows, DirectX 9 or DirectX 11.

3. gles: OpenGL ES 3.0.

These are model-based renderers present in Ren'Py 7.4 and later.

4. gl2: OpenGL 3.3, falling back to OpenGL 2.0.

5. angle2: Windows, DirectX 11 at feature level 10_0 or greater.

6. gles2: OpenGL ES 3.0.

Older versions of Ren'Py supported a software renderer, but this has been removed.

A small fraction of systems may experience problems when running hardware accelerated Ren'Py games. These problems are often due to buggy graphics drivers, and so your first step to fixing them should be to check for an update to your graphics card drivers.

If upgrading your video drivers does not fix the problem, you should consider switching video renderers, using the following steps.

1. Hold down Shift while starting Ren'Py, or press Shift+G once Ren'Py has started.

2. From the "Graphics Acceleration" menu that appears, choose the renderer to use.

3. Choose "Quit", then restart Ren'Py.

We suggest trying the GL and ANGLE renderers. The GLES renderers may not function on desktop hardware.

## On Suspend/Resume

We have had reports of systems that lose textures when a computer is suspended and resumed. This is likely a problem with the computer or its device drivers, but it is possible to force Ren'Py to reload the textures by resizing the window, or pressing the F key to toggle fullscreen mode.

## Flickering Variable Refresh Rate Displays

On some systems with variable refresh rate displays (such as G-Sync or FreeSync displays), visible flickering may occur when the display's refresh rate changes. This is a property of the display. By default, when the screen is static, Ren'Py will slow the framrate to 5 FPS to reduce power consumption.

To disable this power-saving feature, press shift+G when the game is running, navigate to the "Powersave" section, and choose "Disable." You can then choose "Return" and resume the game - despite the warning about changes taking effect the next time the program is run, this change will take effect immediately.