On Tue, Mar 1, 2011 at 6:51 PM, Ted Brenner <
griztown@xxxxxxxxx> wrote:
> So I made these changes but now I get the following error after typing in
> #xm vncviewer domainID
>
> invoking vncviewer
0.0.0.0:1
> No protocol specified
> Error: Can't open display: :0.0
>
> I'm currently listening on 0.0.0.0 but I've also tried 127.0.0.1 with the
> same affect. What would cause this error?
>
> On Sun, Feb 27, 2011 at 10:27 PM, Fajar A. Nugraha <
list@xxxxxxxxx> wrote:
>>
>> On Mon, Feb 28, 2011 at 10:15 AM, Ted Brenner <
griztown@xxxxxxxxx> wrote:
>> > Is it possible that in Xen 4.0+, the 'xenfb.video' should be added to
>> > the
>> > kernel line of the /boot/grub/menu.lst file?
>> >
>> > On Sun, Feb 27, 2011 at 10:49 AM, Ted Brenner <
griztown@xxxxxxxxx>
>> > wrote:
>> >>
>> >> Hi all,
>> >>
>> >> I'm trying to expand the screen resolution of my guest when using vnc.
>> >> It
>> >> appears I need to use the extra variable in my guest config file and
>> >> xenfb.
>> >> I pass it in like this:
>> >>
>> >> extra = 'xenfb.video=8,1024,768'
>> >>
>> >> I can see this being passed to the kernel when it boots but it doesn't
>> >> change the vnc screen resolution.
>>
>> Thanks for pointing out that parameter.
>>
>> There are three parts answer to your question.
>>
>> The first part, being how to pass a parameter to kernel. That would
>> depend on how you boot domU:
>> - If you use pygrub/pv-grub, then the correct way to pass it would be
>> to edit domU's grub config file (or some other config file that is
>> used to generate it, like /etc/default/grub).
>> - If you use pygrub, you might be able to use "args" to add it without
>> editing domU's grub config file
>> - If you use "kernel" and "ramdisk", then the right way to add it is
>> on "extra" line (which should already contain things like "root=")
>> You can check with "cat /proc/cmdline" inside domU to see if the
>> parameter is correctly passed to domU kernel.
>>
>> The second part is where to put the parameter:
>> - If xen vfb support is compiled built-in in domU kernel, then the
>> only place to pass it is on domU kernel command line, using one oh the
>> three options mentioned above
>> - If xen vfb support is built as a module, you can pass it on domU
>> kernel command line, or by simply creating a .conf file on
>> /etc/modprobe.d (recommended)
>>
>> The third part is what's the correct module name, and what parameter
>> to pass. In Ubuntu maverick, the module name is xen-fbfront.
>> $ modinfo xen-fbfront
>> filename:
>> /lib/modules/2.6.35-25-generic/kernel/drivers/video/xen-fbfront.ko
>> alias: xen:vfb
>> license: GPL
>> description: Xen virtual framebuffer device frontend
>> srcversion: 0EB34742ACF8D2559403034
>> depends: fb_sys_fops,syscopyarea,sysfillrect,sysimgblt
>> vermagic: 2.6.35-25-generic SMP mod_unload modversions
>> parm: video:Video memory size in MB, width, height in pixels
>> (default 2,800,600) (array of int)
>>
>>
>> So considering all three parts, if you use Ubuntu maverick and want to
>> use 1280x1024, you can just create a file like this:
>> $ cat /etc/modprobe.d/xen-fbfront.conf
>> options xen-fbfront video=32,1280,1024
>>
>> A "depmod -a" and "update-initramfs -u" might be needed afterwards.
>> After reboot, it should correctly use 1280x1024 resolution.
>>
>> I still say you should use things like NX/xrdp/vnc server inside domU
>> though (my favorite is xrdp). It's smooth, easy to install (apt-get
>> install xrdp), can allow you to choose different resolution without
>> having to reboot (just specify the desired resolution and color depth
>> when you connect), and allows you to have multiple GUI session to the
>> client (using idfferent user-resolution-depth combination)
>>
>> --
>> Fajar
>
>
>
> --
> Ted Brenner
>
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