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

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
......@@ -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;
}
......
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