On Tue, Sep 25, 2012 at 2:17 AM, Dave Airlie <airlied@xxxxxxxxx> wrote:
> From: Dave Airlie <airlied@xxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxx
> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
I'm not familiar with the hw, but looks reasonable.
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxxxx>
> ---
> drivers/gpu/drm/udl/udl_connector.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
> index ba055e9..8d9dc44 100644
> --- a/drivers/gpu/drm/udl/udl_connector.c
> +++ b/drivers/gpu/drm/udl/udl_connector.c
> @@ -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;
> }
>
> --
> 1.7.12
>
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