diff options
Diffstat (limited to 'src/drivers')
| -rw-r--r-- | src/drivers/intel/gma/opregion.c | 21 |
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; |