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xen-devel
Re: [Xen-devel] Screen corruption and crash at boot with Xen 4.1.0 & lin
On Thu, Jun 02, 2011 at 02:08:03PM +0100, Anthony Wright wrote:
> I have a custom built system based on LFS 6.6 with xen 4.1.0 & linux 2.6.39
> built from source. The system boots correctly on one system (after a problem
> with the USB disk has been worked around), however when I try to boot the
> same system on another machine the screen corrupts shortly after handover
> from the bootloader. This happens on 2 out of the 3 machines I have tried it
> on.
>
> I was originally using xen 4.1.0 & linux 2.6.38.7, and with this combination
> the bootloader would work correctly, xen would work correctly and it would
> crash and the screen corrupt on the handover from xen to linux. I had a hunt
> around and found http://wiki.xensource.com/xenwiki/XenPVOPSDRM which talks
> about the graphics subsystem and says "What is boils down to is: if you want
> to use a stock kernel from ftp.kernel.org wait till 2.6.39 gets released". As
> a result I have switched to xen 4.1.0 & linux 2.6.39 but get the same result.
We missed a couple of patches and had to revert some.
>
> The motherboard is a Gigabit GA-MA69VM-S2.
>
> The lspci -vvv output is attached.
>
> What I did notice is the way the screen resolution changes during boot is
> different for the two main machines that I test on. On the machine that
> works, instead of the 80x25 console that I'm used to with xen 3.4.1, I get a
> much higher resolution output with two penguins at the top with 4.1.0. When I
> boot the system without the xen hypervisor linux starts at the 80x25
> resolution but then quickly puts the screen into high resolution. On the
> machine that fails, when I boot the system without the xen hypervisor, linux
> starts at 80x25 resolution, appears to do a resolution change (whole screen
> flickers) a few seconds later but leaves the resolution at 80x25.
>
> Am I doing something wrong? Is this a bug? Is there a workaround? Should I
> try a different kernel version?
Try git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/2.6.39.x
and if that does not work, on top of that branch, also try reverting these two
patches:
03a80665341bbb9a57064c2ddeca13b554d56893
("drm/radeon/nouveau: fix build regression on alpha due to Xen changes.)
and
d87dfdbfc91c5e37288e7e8f7afdd992ba61a60d.
("Revert "ttm: Utilize the DMA API for pages that have TTM_PAGE_FLAG_DMA32
set.")
>
> I'm happy to live with the 80x25 resolution screen but none of the screen
> resolution options that I've tried have had any effect.
>
> Thanks,
>
> Anthony.
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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