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modesetting: Work around vm cursor pitch quirks

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When running in a virtual machine, the cursor pitch
may not behave the same as it does on bare metal.

This patch disables a power consumption optimization
when running in a vm, working around the cursor pitch issues.

This means that some vm users who previously had a working
cursor pitch may now see some increased power consumption.

Fixes: https://github.com/X11Libre/xserver/issues/1816

Signed-off-by: stefan11111 <stefan11111@shitposting.expert>
This commit is contained in:
stefan11111
2026-01-31 03:22:03 +02:00
committed by Enrico Weigelt
parent 4ee2a5e16a
commit 61aa2ede91
1 changed files with 38 additions and 0 deletions
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38
hw/xfree86/drivers/video/modesetting/drmmode_display.c
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@@ -4870,6 +4870,40 @@ drmmode_reset_cursor(drmmode_crtc_private_ptr drmmode_crtc)
drmmode_crtc->cursor_pitches = NULL;
}
/**
* Some setups have different requirements for the
* cursor pitch compared to intel and nvidia.
*
* See: https://github.com/X11Libre/xserver/issues/1816
*
* This function detects whether we are running in a vm,
* or on bare metal.
*
* Driver names are taken from https://drmdb.emersion.fr/drivers
*/
static inline Bool
drmmode_legacy_cursor_probe_allowed(drmmode_ptr drmmode)
{
drmVersionPtr version = drmGetVersion(drmmode->fd);
if (!version) {
return FALSE;
}
if (!version->name ||
strstr(version->name, "bochs-drm") ||
strstr(version->name, "evdi") ||
strstr(version->name, "vboxvideo") ||
strstr(version->name, "virtio_gpu") ||
strstr(version->name, "vkms") ||
strstr(version->name, "vmwgfx")) {
drmFreeVersion(version);
return FALSE;
}
drmFreeVersion(version);
return TRUE;
}
/*
* This is the old probe method for the minimum cursor size.
* This is only used if the SIZE_HINTS probe fails.
@@ -4890,6 +4924,10 @@ static void drmmode_probe_cursor_size(xf86CrtcPtr crtc)
drmmode_crtc->cursor_probed = TRUE;
if (!drmmode_legacy_cursor_probe_allowed(drmmode)) {
return;
}
xf86DrvMsg(crtc->scrn->scrnIndex, X_WARNING,
"Probing the cursor size using the old method\n");