Re: [CentOS-virt] Video resolution for CentOS guest

[Robert Nichols]

On 02/24/2015 03:18 PM, Digimer wrote:


In my experience, once I set the resolution, it keeps that resolution
through reboots/logins. The initial login page sits at 1024x768, but
once logged in, it takes the resolution I asked for.


It's working that way for me now that I have installed kernel-ml-3.19.0
from elrepo in the guest.  With the 2.6.32 kernel that CentOS 6
provides, the behavior could best be described as confused.  I might
get a login screen at 1024x768 but with the content rendered as though
it were 1440x900 and the login dialog half off the edge of the screen.
Or, I might be logged in and looking at a screen properly drawn at
1024x768, but when I bring up the display preferences dialog it claims I
am already at 1440x900 and refuses to change.  And, occasionally when I
would try to change the resolution the display would lock up and, one
time, the whole X server crashed.

All that goes away with the guest running 3.19.0 kernel, and that also
makes sound work properly in the guest, so I'm happy now, at last.

--
Bob Nichols NOSPAM is really part of my email address.
Do NOT delete it.

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Re: [CentOS-virt] Video resolution for CentOS guest

[Digimer]

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Hash: SHA1

On 23/02/15 11:11 PM, Robert Nichols wrote:
 Would someone please point me to some reasonably current
 instructions for getting greater than 1024x768 video resolution for
 a CentOS 6 guest on a CentOS 6 KVM/qemu host?  When I search online
 I find stuff from 2009 and 2010 saying, For details see ..., and
 linking to a URL that no longer exists, or pages that say, You
 need to switch from VNC to Spice, and giving a long list of
 out-of-date instructions for doing so.  (With virt-manager it takes
 2 clicks to do that.  Of course it doesn't help -- still maxes out
 at 1024x768.)
 
 I've found that I can just append vga=0x380 to the kernel
 command line and see Plymouth come up with the full graphical boot
 screen in the correct 1440x900 resolution, but as soon as gdm
 starts up, the display scrambles.  I find suggestions to generate
 an xorg.conf file, but no mention of what to put in it.  I can run
 Xorg -configure, but the resulting file contains nothing about
 video modes, so it's not apparent what needs to be added.
 
 I find it particularly annoying that a Windows 7 guest can set any 
 resolution I want up to 2560x1600, but a Linux guest can't go
 higher than 1024x768.

I played with this and found that, in fact, I had to switch the spice
/ qxl. With that change, I had no trouble pushing EL6 to much higher
resolutions.

- -- 
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without
access to education?
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