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diff -up xf86-video-vesa-2.4.0/src/vesa.c.jx xf86-video-vesa-2.4.0/src/vesa.c
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--- xf86-video-vesa-2.4.0/src/vesa.c.jx 2018-10-16 15:06:11.000000000 -0400
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+++ xf86-video-vesa-2.4.0/src/vesa.c 2018-10-16 15:06:56.659622560 -0400
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@@ -846,9 +846,38 @@ VESAPreInit(ScrnInfoPtr pScrn, int flags
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memcpy(pVesa->Options, VESAOptions, sizeof(VESAOptions));
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xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, pVesa->Options);
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- /* Use shadow by default */
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- pVesa->shadowFB = xf86ReturnOptValBool(pVesa->Options, OPTION_SHADOW_FB,
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- TRUE);
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+ /* Use shadow by default, for non-virt hardware */
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+ if (!xf86GetOptValBool(pVesa->Options, OPTION_SHADOW_FB, &pVesa->shadowFB))
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+ {
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+ switch (pVesa->pciInfo->vendor_id) {
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+ case 0x1234: /* bochs vga (not in pci.ids) */
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+ case 0x15ad: /* vmware */
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+ case 0x1b36: /* qemu qxl */
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+ case 0x80ee: /* virtualbox */
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+ case 0xaaaa: /* parallels (not in pci.ids) */
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+ pVesa->shadowFB = FALSE;
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+ break;
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+
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+ case 0x1013: /* qemu's cirrus emulation */
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+ if (pVesa->pciInfo->subvendor_id == 0x1af4)
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+ pVesa->shadowFB = FALSE;
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+ else
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+ pVesa->shadowFB = TRUE;
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+ break;
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+
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+ case 0x1414: /* microsoft hyper-v */
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+ if (pVesa->pciInfo->device_id == 0x5353)
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+ pVesa->shadowFB = FALSE;
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+ else
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+ pVesa->shadowFB = TRUE;
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+ break;
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+
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+ default:
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+ pVesa->shadowFB = TRUE;
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+ break;
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+ }
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+ }
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+
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/* Use default refresh by default. Too many VBE 3.0
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* BIOSes are incorrectly implemented.
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*/
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