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Commit 3a758858 authored by Dave Airlie's avatar Dave Airlie Committed by Dave Airlie
Browse files

drm/udl: limit modes to the sku pixel limits. 



Otherwise when X starts we commonly get a black screen scanning
out nothing, its wierd dpms on/off from userspace brings it back,

With this on F18, multi-seat works again with my 1920x1200 monitor
which is above the sku limit for the device I have.

Cc: stable@vger.kernel.org
Reviewed-by: default avatarAlex Deucher <alexander.deucher@gmail.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 68c4fce7

drivers/gpu/drm/udl/udl_connector.c

+7 −0
Original line number Diff line number Diff line
@@ -69,6 +69,13 @@ static int udl_get_modes(struct drm_connector *connector) 
static int udl_mode_valid(struct drm_connector *connector,

			  struct drm_display_mode *mode)

{

	struct udl_device *udl = connector->dev->dev_private;

	if (!udl->sku_pixel_limit)

		return 0;



	if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)

		return MODE_VIRTUAL_Y;



	return 0;

}