i915: put ARX back into index mode before doing restore

Fixes resume from hibernate in some configurations.

diff --git a/linux-core/i915_drv.c b/linux-core/i915_drv.c
index cfcb62e..e18bc8d 100644 (file)
--- a/linux-core/i915_drv.c
+++ b/linux-core/i915_drv.c
@@ -247,6 +247,7 @@ static void i915_restore_vga(struct drm_device *dev)
                           dev_priv->saveGR[0x18]);
 
        /* Attribute controller registers */
+       inb(st01); /* switch back to index mode */
        for (i = 0; i < 20; i++)
                i915_write_ar(st01, i, dev_priv->saveAR[i], 0);
        inb(st01); /* switch back to index mode */