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authorDave Airlie <airlied@redhat.com>2012-09-25 10:17:43 +0400
committerDave Airlie <airlied@gmail.com>2012-09-26 12:40:21 +0400
commit3a75885848996baab5276ff37ebf7295c3c753f0 (patch)
tree8248846623aed1de88c5347fe48724df57dbffd9 /drivers/gpu/drm/udl
parent68c4fce737c4b963e336435f225621dc21138397 (diff)
downloadlinux-3a75885848996baab5276ff37ebf7295c3c753f0.tar.xz
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: Alex Deucher <alexander.deucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/udl')
-rw-r--r--drivers/gpu/drm/udl/udl_connector.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
index ba055e9ca007..8d9dc44f1f94 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;
}