Intel® graphics drivers and software, compatibility, troubleshooting, performance, and optimization
All support for Intel NUC 7 - 13 systems has transitioned to ASUS. Read latest update.
20362 Discussions

OpenGL v-sync not enabled by default (wglSwapIntervalEXT)


System Setup Information:

System Used: ASUS Zenbook UX305CA
CPU SKU: Intel Core m3-6Y30
GPU SKU: Intel HD Graphics 515
Processor Line:
System BIOS Version: UX305CA.201
CMOS settings:
Graphics Driver Version:,
GOP/VBIOS Version:
Operating System: Windows 10 Home 64-bit
OS Version: 1903 (OS Build 18362.900)
Occurs on non-Intel GPUs?: No


Steps to Reproduce:
1. Create an OpenGL compatible window and device context
2. Check value of swap interval using wglGetSwapIntervalEXT
3. Call SwapBuffers(...) repeatedly to check whether v-sync is enabled

Expected Results:

wglGetSwapIntervalEXT returns the default swap interval of '1' and v-sync is enabled.


Actual Results:

wglGetSwapIntervalEXT returns the default swap interval of '1' but v-sync is not enabled.


Additional Information:

"Vertical Sync" is set to "Use Application Default Settings" in the graphics control panel. Setting the swap interval to 1 via wglSwapIntervalEXT enables v-sync as expected even though wglGetSwapIntervalEXT reports that it was already enabled. This means on Intel I need to explicitly set the swap interval despite both the spec and implementation telling me it is already enabled. Either wglSwapIntervalEXT should initially report 0, which is non-conforming but at least consistent, or v-sync should be enabled by default as specified by the WGL_EXT_swap_control extension. (cf.

0 Kudos
0 Replies