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-rw-r--r--src/drivers/intel/gma/opregion.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/src/drivers/intel/gma/opregion.c b/src/drivers/intel/gma/opregion.c
index 84bca9bd3a..b6d4e07790 100644
--- a/src/drivers/intel/gma/opregion.c
+++ b/src/drivers/intel/gma/opregion.c
@@ -260,7 +260,26 @@ intel_gma_init_igd_opregion(igd_opregion_t *opregion)
/* 8kb */
opregion->header.size = sizeof(igd_opregion_t) / 1024;
- opregion->header.version = IGD_OPREGION_VERSION;
+
+ /*
+ * Left-shift version field to accomodate Intel Windows driver quirk
+ * when not using a VBIOS.
+ * Required for Legacy boot + NGI, UEFI + NGI, and UEFI + GOP driver.
+ *
+ * Tested on: (platform, GPU, windows driver version)
+ * samsung/stumpy (SNB, GT2, 9.17.10.4459)
+ * google/link (IVB, GT2, 15.33.4653)
+ * google/wolf (HSW, GT1, 15.40.36.4703)
+ * google/panther (HSW, GT2, 15.40.36.4703)
+ * google/rikku (BDW, GT1, 15.40.36.4703)
+ * google/lulu (BDW, GT2, 15.40.36.4703)
+ * google/chell (SKL-Y, GT2, 15.45.21.4821)
+ * google/sentry (SKL-U, GT1, 15.45.21.4821)
+ * purism/librem13v2 (SKL-U, GT2, 15.45.21.4821)
+ *
+ * No adverse effects when using VBIOS or booting Linux.
+ */
+ opregion->header.version = IGD_OPREGION_VERSION << 24;
// FIXME We just assume we're mobile for now
opregion->header.mailboxes = MAILBOXES_MOBILE;