linux-kernel - Re: bit errors on spitz

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Message-ID: <20100308133221.GB14904@atrey.karlin.mff.cuni.cz>
Date:	Mon, 8 Mar 2010 14:32:21 +0100
From:	Cyril Hrubis <metan@....cz>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Stanislav Brabec <utx@...guin.cz>,
	Eric Miao <eric.y.miao@...il.com>, dbaryshkov@...il.com,
	arminlitzel@....de, kernel list <linux-kernel@...r.kernel.org>,
	Dirk@...er-online.de, lenz@...wisc.edu, rpurdie@...ys.net,
	omegamoon@...il.com, Pavel Machek <pavel@....cz>,
	thommycheck@...il.com, zaurus-devel@...ts.linuxtogo.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: bit errors on spitz

Hi!
> Is this display rotated by 90 degrees?

Yes it is.

> If so, they're actually horizontal lines as far as the display scanning
> is concerned - and that tends to suggest that there's insufficient system
> bus bandwidth for all the activity taking place, and the LCD controller
> is being starved of data.

Well, when doing 'echo 0 > /sys/class/graphics/fbcon/rotate_all' for 2.6.33
I've got the same problem but the lines are vertical. However 2.6.24 seems to
work in non rotated mode.

> I've seen similar (described) effects on SA1110 systems in past years
> with low clock rates.
> 
> Some of the reports suggest that this happens with multiple kernel versions
> and is not something new to the latest kernels.  Please confirm when the
> problem started.

As far as I can test in rotated mode it happens for kernels from 2.6.24 to
2.6.33 (I haven't older kernel than 2.6.24 that boots on spitz). 

-- 
metan
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