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

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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: Alex Deucher <alexander.deucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2012-09-25 16:17:43 +10:00 committed by Dave Airlie
parent 68c4fce737
commit 3a75885848
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/udl/udl_connector.c
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@ -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;
}