From mboxrd@z Thu Jan 1 00:00:00 1970 From: marex@denx.de (Marek Vasut) Date: Wed, 29 Jan 2014 15:53:14 +0100 Subject: imx-drm: screen flickering In-Reply-To: <20140129111557.GI16215@pengutronix.de> References: <20140129111557.GI16215@pengutronix.de> Message-ID: <201401291553.15040.marex@denx.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wednesday, January 29, 2014 at 12:15:57 PM, Sascha Hauer wrote: > Hi Christian, > > On Tue, Jan 28, 2014 at 09:11:32AM +0100, Christian Gmeiner wrote: > > Hi all. > > > > From time to time it happens that my LVDS display is flickering (look > > at scroll bar in the video). > > https://drive.google.com/file/d/0B_fznDimUHVubWtvVFlMTkdBbUU/edit?usp=sha > > ring > > > > I really want to find the root cause of it, but I do not know where to > > start. I can trigger this > > sometimes after xscreensever "blanks" the screen and the screensafer > > gets disabled > > via user input. > > > > Any hints? > > Sorry, no idea. Philipp and me watched the video, but we both haven't > seen something like this before. Isn't it the clock polarity being inverted thing again [1]? [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2013- December/215536.html The easiest way to check this would be to try sig_cfg.clk_pol = 0 or = 1 and see if it changes anything. Best regards, Marek Vasut