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to Spice," and giving a long list of out-of-date instructions for doing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.
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
-----BEGIN PGP SIGNED MESSAGE----- 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 out-of-date instructions for doing so.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? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJU7APUAAoJECChztQA3mh0OCoP/jW8jmGWWVdIirc+4G+kvo+S LZrJxIxZVDfJHioICZink8JJOKm9m5k8k0FKB6YonoLNWOgk8HlHfTTzG9dToT/C Rk3oTrI8pDCsMwccngd0VSVR2EQtmzQBp/O/38JHPM0/VjKnum/I1NWli8g5Xoq2 Q1BqAbrYJ2SAhVht2G91DKsP/nPLq93hBU+UrJkhg5bi3aFCw/Da53v5G3oOZTfr 9qS0RoibthrrF2yCIiXW0kdsEtwk8m+RYFroKjGh/PWcYIKhJdU2Rn8a6gDwRYPg 90fVCYwrqir1HChWsYGc0q+p3DNh/0WmPHjbfbs5o66erD2MZkkm7tbyM8gTcl3F 03wKyhO8qoFcCcgbLRBDb/pYKMX3ChOw7b1RFrYah1xWlZCNAWaBCVYm7DUGMfrV zqb70dVEkUch6f+rVxEo6mrWlj4927Pnp9pefTJ6aVibLZZBA040cVCMTpAwpa7H VsR3QhCcwhOpsCdn0WRCZFJyWlGO88Ry5A0RMUHrceBh0wPdTPPDhMiSg1qTlqCT 0VtaBiYeLevEzoMqnqcRI/+wW0/ooJzp5KjkxjFVVVLqwpqNQkHhEMvUBNLuF5Ui 6O5pZSwFk4K1c5sgOfxWkGuvYjKYmUW/BlnsTpulOzHsOVcJwREUC+IrXIftytfI BJ+4n8EX52YmiORmmGRJ =SO1z -----END PGP SIGNATURE-----
On 02/23/2015 10:53 PM, Digimer wrote:> -----BEGIN PGP SIGNED MESSAGE----- > 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.Thank you for the reassurance that it _should_ work. I finally got it going. The VM still always starts out in 1024x768 and I have to set the higher resolution every time I log in. For a while, that was working only the first time I set it, and on subsequent logins any attempt to change the resolution either locked up or caused the Xorg server to crash. All the RPMs verified OK and a forced fsck of the filesystems found nothing. I eventually just reinstalled the whole VM, and it's working now. The whole thing was bringing back bad memories of an ancient version of Slackware and kernel version 0.99pl53. -- Bob Nichols "NOSPAM" is really part of my email address. Do NOT delete it.