GPU Troubleshooting

glmark2 Fails to Start

If glmark2 or glmark2-es2 fails to start, first check the current graphics environment:

echo $DISPLAY
echo $WAYLAND_DISPLAY

In an X11 environment, a valid DISPLAY is usually required. In Wayland or DRM/KMS environments, use a matching EGL backend or the proper test tool options.

Performance Is Low or Software Rendering Is Used

If glmark2-es2 shows llvmpipe, the system is using CPU software rendering. Common causes include:

• The GPU driver is not loaded.
• The userspace GPU library does not match the kernel driver.
• The graphics session is not using the correct EGL/DRI driver.
• Remote desktop, virtual display, or incorrect environment variables caused rendering fallback.

Validate again on a local HDMI/DP display first to rule out remote desktop or virtual display effects.