Red Hat Bugzilla – Bug 991357
The guest display will keep flickering after change it's resolution sevral times
Last modified: 2014-08-15 08:48:45 EDT
Description of problem:
When I change the resolution of a guest with two displays under full-screen mode sevral times, the display will keep flickering.
So I have to restart the guest to stop that.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Prepare a machine with two physical monitors.
2.Create a rhel guest with spice+qxl+spicevmc,and install spice-vdagent in it.
3.# virt-viewer $guest , check on the "Automatically resize", and type 'f11' to change to fullscreen.
4.Make sure can see the two displays of guest are full-screen on each monitor.
5.Change the resolution to a higher one than native resolution sevral times.
The display will keep flickering.
The display should not keep flickering.
And it should change the resolution which I choosed and keep stable.
Is this bug happening with both linux and windows guests? So far, I can reproduce only with current RHEL6.
Can you precise the guest OS, release version, if the spice agent is running, and its version. thanks
(my gut feeling is that it is a linux vdagent bug, but I need to do more research)
I didn't find yet the root cause, however, I can reproduce without vdagent. It doesn't need multimonitor guest.
Moving to bug QXL component (0.1.0-4.el6).
Current upstream/master code doesn't exhibit the bug, however it makes Xorg consume 33% cpu constantly. I removed the edid code from RHEL 0.1.0-4.el6, it seems to help (more testing needed)
Created attachment 782645 [details]
(In reply to Marc-Andre Lureau from comment #2)
> Is this bug happening with both linux and windows guests? So far, I can
> reproduce only with current RHEL6.
> Can you precise the guest OS, release version, if the spice agent is
> running, and its version. thanks
> (my gut feeling is that it is a linux vdagent bug, but I need to do more
Yes, you're right, I can reproduce this without multi-monitor
The guest's OS is RHEL6.4-20130123.0 x86_64
spice-vdagent is running in guest, it's version is:
I add the xorg.0.log to attachment.
BTW, I update the spice-vdagent to the lastest version, it's hard to reproduce, but I change the resolution about 20 times, the guest start to flicker.
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CongDong, I can't reproduce this flickering anymore.
In comment 4, I tried removing edid and it helped. Since EDID has been removed in 0.1.1, it may be the reason why this is now fixed. Please check
I (In reply to Marc-Andre Lureau from comment #8)
> CongDong, I can't reproduce this flickering anymore.
> In comment 4, I tried removing edid and it helped. Since EDID has been
> removed in 0.1.1, it may be the reason why this is now fixed. Please check
I tested with xorg-x11-drv-qxl-0.1.0-4.el6
It's easy to reproduce.
Also tested with xorg-x11-drv-qxl-0.1.0-7.el6 and xorg-x11-drv-qxl-0.1.1-13.el6
Cannot reproduce with them.