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to a URL that no longer exists, or pages that say, "You need to switch from VNC to Spice," and giving a long list of out-of-date instructions for doing so.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.
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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to a URL that no longer exists, or pages that say, "You need to switch from VNC to Spice," and giving a long list of out-of-date instructions for doing so.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?
On 02/23/2015 10:53 PM, Digimer wrote:
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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.
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On 24/02/15 04:15 PM, Robert Nichols wrote:
On 02/23/2015 10:53 PM, Digimer wrote:
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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.
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.
- -- 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?
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.
-
Digimer -
Robert Nichols