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backends/drm: fix vblank calculation

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Due to some misinterpretation of mode timings, the old method calculated vsync, not vblank,
so the resulting duration was much shorter, which caused frame drops on some systems.

BUG: 482064
This commit is contained in:
Xaver Hugl 2024-03-03 19:05:55 +01:00
parent 9e77e5038f
commit da80dd4c84
1 changed files with 1 additions and 1 deletions
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2
src/backends/drm/drm_connector.cpp
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@ -71,7 +71,7 @@ std::shared_ptr<DrmBlob> DrmConnectorMode::blob()
std::chrono::nanoseconds DrmConnectorMode::vblankTime() const
{
return std::chrono::nanoseconds(((m_nativeMode.vsync_end - m_nativeMode.vsync_start) * m_nativeMode.htotal * 1'000'000ULL) / m_nativeMode.clock);
return std::chrono::nanoseconds(((m_nativeMode.vtotal - m_nativeMode.vdisplay) * m_nativeMode.htotal * 1'000'000ULL) / m_nativeMode.clock);
}
drmModeModeInfo *DrmConnectorMode::nativeMode()