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Date: Sun, 09 Aug 2009 12:21:33 +0200 From: Stanislav Brabec <utx@...guin.cz> To: Pavel Machek <pavel@....cz> Cc: dtor@...l.ru, linux-input@...r.kernel.org, rpurdie@...ys.net, lenz@...wisc.edu, kernel list <linux-kernel@...r.kernel.org>, Dirk@...er-Online.de, arminlitzel@....de, Cyril Hrubis <metan@....cz>, thommycheck@...il.com, linux-arm-kernel <linux-arm-kernel@...ts.arm.linux.org.uk>, dbaryshkov@...il.com, omegamoon@...il.com, eric.miao@...vell.com, Cyril Hrubis <metan@....cz> Subject: Re: ads7846: clean up, fix pressure reporting Pavel Machek wrote: > Fix pressure reporting, and clean up debug prints. Thanks. I see much bigger problem with both the old driver and the new ads7846 driver (2.6.30): They are very noisy on my spitz. When you tap to one place, keep stylus pressed and just read values, you get 20-200 pixels long pointer motion trip each second. According to Cyril Hrubiš, it is caused by the electrical noise that originates in the LCD display. The driver needs to read data synchronously with the LCD refresh. He already made the fix for collie several years ago. The pointer test application in the PROM diagnostic utility does not seem to exhibit any noise. ________________________________________________________________________ Stanislav Brabec http://www.penguin.cz/~utx/zaurus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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