Bug 948717 - When using “-vga qxl” together with “-display vnc=:5” or “-display sdl” qemu displays pixel garbage
Summary: When using “-vga qxl” together with “-display vnc=:5” or “-display sdl” qemu...
Alias: None
Product: Fedora
Classification: Fedora
Component: qemu
Version: 20
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Fedora Virtualization Maintainers
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: 1005036 1005037
TreeView+ depends on / blocked
Reported: 2013-04-05 08:10 UTC by Mike FABIAN
Modified: 2013-10-01 02:17 UTC (History)
15 users (show)

Fixed In Version: qemu-1.6.0-8.fc20
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1005036 1005037 (view as bug list)
Last Closed: 2013-09-30 00:39:25 UTC
Type: Bug

Attachments (Terms of Use)
qemu-1.4.0-from-virt-preview-2.png (111.87 KB, image/png)
2013-04-05 08:10 UTC, Mike FABIAN
no flags Details
screenshot showing severe display corruption with "-vga qxl" (636.90 KB, image/png)
2013-07-31 13:33 UTC, Steve Tyler
no flags Details

Description Mike FABIAN 2013-04-05 08:10:29 UTC
Created attachment 731850 [details]

qemu-1.4.0-11.fc18.x86_64 from  https://fedoraproject.org/wiki/Virtualization_Preview_Repository


qemu command line:

ionice -c 3 qemu-kvm -enable-kvm -m 2048M -smp 1 -drive file=./Fedora-19-Alpha-TC4-x86_64-netinst-test.iso.qcow2,index=0,media=disk,cache=unsafe -localtime -serial file:/tmp/qemu-Fedora-19-Alpha-TC4-x86_64-netinst-test.iso.qcow2-output.log -name Fedora-19-Alpha-TC4-x86_64-netinst-test.iso.qcow2 -cdrom /local/mfabian/iso/Fedora-19-Alpha-TC4/Fedora-19-Alpha-TC4-x86_64-netinst.iso -boot c -vga qxl -display vnc=:5 -net nic -net user,hostname=Fedora-19-Alpha-TC4-x86_64-netinst-test.iso.qcow2,hostfwd=tcp::5562-:22 -monitor stdio -usb

The above commandline has “-display vnc=:5”, the problem occurs
with “-display sdl” as well though.

The result is pixel garbage, see attached  screen shot.

When using “-vga std” or  “-vga cirrus” instead  of “-vga qxl” it works
fine, no pixel garbage.

Comment 1 Cole Robinson 2013-04-14 19:55:06 UTC
I can reproduce with upstream. Grab F19 boot.iso here:


And run:

./x86_64-softmmu/qemu-system-x86_64 -enable-kvm -vga qxl -display sdl -cdrom ~/boot.iso -m 2048

Doing -device qxl works fine though. I also tried an F16 live cd I had hanging around and that worked fine, so maybe it's an F19 driver issue.

Alon, Gerd, thoughts?

Comment 2 Cole Robinson 2013-05-27 23:01:01 UTC
Ping, any spice folks want to weigh in on this? Granted qxl->vnc shouldn't be a common setup, but people tend to try it out if hitting graphical issues and wanting to eliminate spice from the equation (for better or worse).

Comment 3 Steve Tyler 2013-07-31 13:33:52 UTC
Created attachment 781134 [details]
screenshot showing severe display corruption with "-vga qxl"

Confirming severe display corruption with the "-vga qxl" option.
With the "-vga std" option, there is no corruption.

By blindly clicking in the upper right corner, pressing the down-arrow four times, and pressing Enter twice, it is possible to power off the VM, if the corrupt display shows parts of the Welcome dialog.

Steps to reproduce:
$ qemu-kvm -m 4096 -cdrom ~/xfr/fedora/F19/Fedora-Live-Desktop-x86_64-19-1.iso -vga qxl

kernel 3.10.3-300.fc19.x86_64

Comment 4 Jan Kratochvil 2013-08-19 18:36:29 UTC
/usr/bin/qemu-kvm -m 2048 -cdrom Fedora-19-x86_64-DVD.iso -boot d -vnc :10 -vga qxl

Comment 5 Mike FABIAN 2013-08-31 06:07:40 UTC
The problem still exists with Fedora-20-Alpha-TC2-x86_64-netinst.iso
and qemu-1.6.0-5.fc19.x86_64

Comment 6 Gerd Hoffmann 2013-09-06 05:22:56 UTC

Comment 7 Cole Robinson 2013-09-08 17:43:37 UTC
Thanks Gerd!

Comment 8 zhonglinzhang 2013-09-13 08:18:36 UTC
Can not reproduce this issue:

host kernel: 2.6.32-417.el6.x86_64

Command line as follows:
ionice -c 3 /usr/libexec/qemu-kvm -M pc -nodefaults  -cpu SandyBridge -enable-kvm -m 4G -smp 2,sockets=1,cores=2,threads=1  -name test -rtc base=localtime,clock=host,driftfix=slew  -k en-us  -boot menu=on  -vga qxl -vnc :5 -monitor stdio ...

host kernel: 3.9.9-201.fc18.x86_64

Command line as follows:
ionice -c 3 qemu-kvm -enable-kvm -m 2048M -smp 1 -drive file=RHEL_65_64.qcow2,media=disk,cache=unsafe  -localtime -boot c -vga qxl  -display sdl -monitor stdio

Actual Results:
Only show pixel garbage before login screen, but very fast passed. the same result with “-vga std” or “-vga cirrus”.

Comment 9 Fedora Update System 2013-09-24 16:22:59 UTC
qemu-1.6.0-8.fc20 has been submitted as an update for Fedora 20.

Comment 10 Fedora Update System 2013-09-25 17:54:09 UTC
qemu-1.4.2-11.fc19 has been submitted as an update for Fedora 19.

Comment 11 Fedora Update System 2013-09-26 06:29:29 UTC
Package qemu-1.6.0-8.fc20:
* should fix your issue,
* was pushed to the Fedora 20 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing qemu-1.6.0-8.fc20'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).

Comment 12 Fedora Update System 2013-09-30 00:39:25 UTC
qemu-1.4.2-11.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 13 Fedora Update System 2013-10-01 02:17:39 UTC
qemu-1.6.0-8.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

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