From: Peter Lieven <lieven-lists@dlhnet.de>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PULL 3/3] cirrus: Fix host CPU blits
Date: Mon, 14 Jul 2014 10:28:50 +0200 [thread overview]
Message-ID: <53C394C2.40707@dlhnet.de> (raw)
In-Reply-To: <1405322943.9343.28.camel@pasglop>
On 14.07.2014 09:29, Benjamin Herrenschmidt wrote:
> On Mon, 2014-07-14 at 09:24 +0200, Peter Lieven wrote:
>> it seems you have digged into the cirrus code recently. Have you an idea how to
>> fix the issue with the graphics corruption for cirrus vga and recent X Server versions?
>>
>> E.g. take an Ubuntu 14.04 Desktop CD, boot it into live mode and open terminal.
>>
>> I have tried to debug it a little, but I have no clue how to solve this. I tried to get
>> hands on a real hardware Cirrus Logic Graphics card and test if this happens there as well,
>> but I had no chance to get one.
> I *think* it is a X server side bug. They broke 24bpp packed pixel
> format. I've seen patches submitted to the Xorg list fairly recently by
> somebody from canonical.
>
> You can test by creating an xorg.conf to force the display to 16bpp
> instead of 24 and see if that helps.
Will do, thanks for the pointer.
Do you see a way to work around this in the graphics driver. E.g. blacklisting 24bpp modes
etc. Even if X.Org people actually merge the fixes there are 2 years of Linux releases out
there that have corrupted graphics.
Peter
next prev parent reply other threads:[~2014-07-14 8:29 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-11 10:24 [Qemu-devel] [PULL 0/3] vga: some cirrus fixes Gerd Hoffmann
2014-07-11 10:24 ` [Qemu-devel] [PULL 1/3] cirrus_vga: adding sanity check for vram size Gerd Hoffmann
2014-07-11 10:24 ` [Qemu-devel] [PULL 2/3] cirrus: Fix build of debug code Gerd Hoffmann
2014-07-11 10:24 ` [Qemu-devel] [PULL 3/3] cirrus: Fix host CPU blits Gerd Hoffmann
2014-07-14 7:24 ` Peter Lieven
2014-07-14 7:29 ` Benjamin Herrenschmidt
2014-07-14 7:33 ` Benjamin Herrenschmidt
2014-07-14 8:28 ` Peter Lieven [this message]
2014-07-14 9:53 ` Gerd Hoffmann
2014-07-14 12:56 ` Peter Lieven
2014-07-14 16:03 ` Gerd Hoffmann
2014-07-11 17:47 ` [Qemu-devel] [PULL 0/3] vga: some cirrus fixes Peter Maydell
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