Print a warning if a user-specifed display mode is not supported by
the display pipeline. Users specified the display mode on the kernel
command line with the use of the video= parameter. Setting an
unsupported mode will leave the console blank, so we should at least
let the user know why.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/drm_modes.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 14b746f7ba97..40b7b245e98c 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1328,6 +1328,10 @@ void drm_mode_prune_invalid(struct drm_device *dev,
list_for_each_entry_safe(mode, t, mode_list, head) {
if (mode->status != MODE_OK) {
list_del(&mode->head);
+ if (mode->type & DRM_MODE_TYPE_USERDEF) {
+ drm_warn(dev, "User-defined mode not supported: "
+ DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
+ }
if (verbose) {
drm_mode_debug_printmodeline(mode);
DRM_DEBUG_KMS("Not using %s mode: %s\n",
--
2.36.0
