[PATCH] This patch fixes a problem where a DisplayLink device autoselects a suboptimal framebuffer r

[PATCH] This patch fixes a problem where a DisplayLink device autoselects a suboptimal framebuffer r

[William Katsak]

The situation in which the problem occurred was with a Plugable UGA-2K-A
connected to a Samsung EX2220X display. The driver indicates that
1920x1080 is a valid mode (the first mode available, in fact), but
proceeds to set the framebuffer size to 1600x1200.

The patch corrects what seems to be a logic error, regarding unsetting
the FB_MISC_1ST_DETAIL flag, if the first (top/best) mode is invalid.
The existing code unset the flag if ANY mode was invalid.

Signed-off-by: William Katsak <william.katsak@alcatel-lucent.com>
---
 drivers/video/udlfb.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
index 52b0f3e..816a4fd 100644
--- a/drivers/video/udlfb.c
+++ b/drivers/video/udlfb.c
@@ -1233,8 +1233,12 @@ static int dlfb_setup_modes(struct dlfb_data *dev,
 			if (dlfb_is_valid_mode(&info->monspecs.modedb[i], info))
 				fb_add_videomode(&info->monspecs.modedb[i],
 					&info->modelist);
-			else /* if we've removed top/best mode */
-				info->monspecs.misc &= ~FB_MISC_1ST_DETAIL;
+			else {
+				if (i = 0)
+					/* if we've removed top/best mode */
+					info->monspecs.misc
+						&= ~FB_MISC_1ST_DETAIL;
+			}
 		}
 
 		default_vmode = fb_find_best_display(&info->monspecs,
-- 
1.7.3.4

Re: [PATCH] This patch fixes a problem where a DisplayLink device autoselects a suboptimal framebuff

[Paul Mundt]

On Thu, Jun 23, 2011 at 09:16:29AM -0400, William Katsak wrote:
> The situation in which the problem occurred was with a Plugable UGA-2K-A
> connected to a Samsung EX2220X display. The driver indicates that
> 1920x1080 is a valid mode (the first mode available, in fact), but
> proceeds to set the framebuffer size to 1600x1200.
> 
> The patch corrects what seems to be a logic error, regarding unsetting
> the FB_MISC_1ST_DETAIL flag, if the first (top/best) mode is invalid.
> The existing code unset the flag if ANY mode was invalid.
> 
> Signed-off-by: William Katsak <william.katsak@alcatel-lucent.com>

Applied, thanks.