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Update xf86Crtc.c to fix issue #122 

This change makes the Default Mode Selection set itself to Highest Refresh Rate or fallback to the default setting in xorg.conf
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Collin 2025-06-26 19:15:21 -05:00 committed by GitHub
parent 3e1c2d5456
commit 25a395aff8
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GPG Key ID: B5690EEEBB952194
1 changed files with 16 additions and 3 deletions
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19
hw/xfree86/modes/xf86Crtc.c
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@ -1449,12 +1449,25 @@ preferredMode(ScrnInfoPtr pScrn, xf86OutputPtr output)
{
const char *preferred_mode = NULL;
/* Check for a configured preference for a particular mode */
preferred_mode = xf86GetOptValString(output->options,
OPTION_PREFERRED_MODE);
/* First: user-configured preferred mode */
preferred_mode = xf86GetOptValString(output->options, OPTION_PREFERRED_MODE);
if (preferred_mode)
return preferred_mode;
/* Try to find a mode with ~75Hz refresh rate */
DisplayModePtr mode = output->probed_modes;
while (mode) {
/* Some drivers don’t populate VRefresh—manually calculate it */
float refresh = 0.0f;
if (mode->HTotal > 0 && mode->VTotal > 0)
refresh = ((float)mode->Clock * 1000.0f) /
((float)mode->HTotal * (float)mode->VTotal);
if ((int)(refresh + 0.5f) >= 75)
return mode->name;
mode = mode->next;
}
/* Fallback: use first mode in display list */
if (pScrn->display->modes && *pScrn->display->modes)
preferred_mode = *pScrn->display->modes;