Bug 928225

Summary: cirrus guest screen is too big!
Product: [Fedora] Fedora Reporter: Jens Petersen <petersen>
Component: qemuAssignee: Fedora Virtualization Maintainers <virt-maint>
Status: CLOSED WONTFIX QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 18CC: amit.shah, berrange, cfergeau, crobinso, dwmw2, itamar, jbastian, lersek, mfabian, pbonzini, rjones, scottt.tw, stephent98, virt-maint, xgl-maint
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-12-17 18:09:25 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
virsh dumpxml F18 none

Description Jens Petersen 2013-03-27 08:15:35 UTC 
Description of problem:
When using the cirrus graphics drivers with virt-manager guests
the screen is very large compared to other drivers - in fact
it is too large to fit on most standard monitor sizes which
is annoying - specially since it seems to be the most reliable
stable virt graphics driver (though by default I use qxl these days).

Steps to Reproduce:
1. start a Fedora guest vm with cirrus graphics
  
Actual results:
1. guest screen is big - height is more than 1000
and does not fit completely on my 1920x1080 monitor.

Expected results:
1. cirrus screen to be similar size to other virt graphics drivers
(~1024x800?)

Additional info:
Basically means one has to scale guest screens using cirrus always
which looks ugly and hard to read.
Comment 1 Paolo Bonzini 2013-03-27 17:15:27 UTC 
What version of Fedora in the guest VM?  Also can you give us the XML for the virtual machine (virsh dumpxml "<VM name>")?
Comment 2 Paolo Bonzini 2013-03-27 18:00:30 UTC 
Works here with the F17 live CD, I get something that looks like 1024x768.
Comment 3 Jens Petersen 2013-03-28 02:54:01 UTC 
Yes F17 guests seem ok - I see the problem with F18 and F19 guests at least.
Comment 4 Jens Petersen 2013-03-28 02:58:42 UTC 
Created attachment 717413 [details]
virsh dumpxml F18
Comment 5 Jens Petersen 2013-03-28 03:01:47 UTC 
(I see the large graphics screen size both running qemu-kvm directly
and from recent Fedora guests started from Virt Manager.)
Comment 6 Laszlo Ersek 2013-05-14 15:38:39 UTC 
I had written a small wiki page with workarounds for console and X:

https://fedoraproject.org/wiki/Display_resolution_of_Fedora_18_virtual_machines
Comment 7 Cole Robinson 2013-12-17 18:09:25 UTC 
F18 is still affected here, but up2date F19 doesn't have this issue for me anymore with cirrus graphics.

Since F18 is end-of-life soon, this issue is unlikely to be fixed there, so closing. Please reopen if anyone can reproduce on newer fedora
Comment 8 Cole Robinson 2013-12-17 18:12:14 UTC 
*** Bug 966226 has been marked as a duplicate of this bug. ***
Comment 9 Laszlo Ersek 2013-12-17 18:57:11 UTC 
(In reply to Cole Robinson from comment #7)
> F18 is still affected here, but up2date F19 doesn't have this issue for me
> anymore with cirrus graphics.

That's probably due to the following kernel commit (in v3.13-rc1):

commit 121a6a17439b000b9699c3fa876636db20fa4107
Author: Gerd Hoffmann <kraxel>
Date:   Fri Oct 11 10:01:09 2013 +0200

    drm/cirrus: use drm_set_preferred_mode
    
    Explicitly set 1024x768 as default mode, so the display doesn't come up
    with the largest supported mode.
    
    While being at it drop first three drm_add_modes_noedid calls.  As
    drm_add_modes_noedid fills the mode list with modes from the database
    *up to* the specified size it is pretty pointless to call it multiple
    times with different sizes.
    
    Signed-off-by: Gerd Hoffmann <kraxel>
    Signed-off-by: Dave Airlie <airlied>

So I agree with the closure; under Fedora 18 the workaround in comment 6 should be available.