Red Hat Bugzilla – Bug 458745
Video tearing with X700 and LCD
Last modified: 2018-04-11 04:36:44 EDT
Created attachment 314034 [details]
Picture of glxgears
I have an ATI Radeon X700 XL connected via a DVI-to-HDMI cable (I also tried a DVI-to-DVI) to a Samsung SyncMaster 2493HM. I am running at 1920x1200, the panel native resolution. The problem is that I get video tearing, especially with high-refresh things like glxgears. By tearing I mean horizontal lines flickering across the screen, and the whole screen flickering horizontally.
I took a picture of glxgears running. Of course the gears are blurred (and the picture is kind of grainy), but you can see the horizontal lines along the left edge of the screen and to the right of the gears. The whole screen is doing this (not just those spots), but that was the best picture I could come up with.
It also happens when I switch desktop workspaces sometimes (and sometimes worse than other times).
Created attachment 314036 [details]
My config uses EXA; I also tried with the default XAA and had the same results.
Created attachment 314037 [details]
X log file
This can even happen when something is happening in another workspace (i.e. nothing is updating the actual display). For example, I clicked on this bug and switched to another workspace to check something while this page loaded, and the screen jumped/flickered when Firefox loaded and rendered the page.
There have been bunch of bug fixes
Could you retest with the latest kernel
( -132 at the time of this writing )
You can get the latest kernel build here
And with the latest xorg-x11-drv-ati.
( -60 at the time of this writing )
You can get the latest xorg-x11-drv-ati build here
And report back if it either improves or fixes this issue..
I tried these on an otherwise F9 system, pulling in some dependencies from rawhide (alsa-utils fedora-logos hal hal-libs initscripts libdrm libvolume_id mkinitrd nash pciutils-libs plymouth plymouth-libs plymouth-scripts udev).
Now my cursor is messed up (a garbage block) and I have no acceleration (glxgears gives me ~44 FPS). I don't get any tearing now.
Could we get fresh /var/log/Xorg.0.log, please?
Created attachment 325445 [details]
X log file
I had switched back to the F9 versions, so I pulled new packages from koji (kernel 188.8.131.52-134.fc10 and xorg-x11-drv-ati 6.9.0-61.fc10). Also, just to make sure nothing in my xorg.conf was weird, I tried with it renamed it out of the way (it made no difference). With today's packages, the cursor is fine again, but I still get 38-44 FPS from glxgears.
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