XL2411 with vt1500 causes HD video lag

[mk262]

I'm running a XL2411 with a radeon r9 290 4gb (gigabyte). I'm noticing a problem where, after I run the driver patcher and do the vt1500 change, that any video 720p or higher will playback at unplayable (slow) frame rates and lag my cursor.

I've experienced this with CCC 14.9 and 14.9.1. Has anyone else had this problem?

Edit: I did a driver uninstall/reinstall. Before I ran the patcher and the vt1500 fix, video playback was fine. Afterward, broken.
Edit 2: occurs at vt1350 as well

[Falkentyne]

The atimtag(?) pixel clock patcher breaks HD hardware accelerated video in some driver versions. In the old (early/initial release) 14.x beta 290x drivers, the ones pre-mantle, video playback was fine with the patcher. In newer drivers, it breaks it.
You can click the flash window and turn off video acceleration. If you still get blank screens, turning off video acceleration in internet explorer should fix this completely.

A workaround is to not use the patcher, and reduce the horizontal lines (and refresh rate) to stay under 330 MHz bandwidth, then you can use 1350 VT.

You should be able to use 1500 VT even at 100hz, without the patcher, if you use 2080 horizontal total (the default for 24" screens) instead of 2200 (the default for 27" screens) even if you are using a 27"; its the same panel manufacturer anyway, so 2080 will work fine on the 27". This wont work for 120hz (the lowest you would be at is 330 with 2080/1350, IIRC).

[mk262]

You can click the flash window and turn off video acceleration.

Forgive me, what are you referring to in this sentence?

[Falkentyne]

adobe hardware acceleration (flash player), when you right click the video winow and click global settings.
In internet explorer theres also a setting for use software rendering instead of gpu rendering.

[mk262]

Ok, gotcha. So there's no fix for MPC HC then. Are we hoping that AMD fixes this in a future driver?

[mk262]

Bump.

I broke down and went to 100hz without the patcher and it seems to work. Has anyone had better results with 14.12 (release today)?

[Falkentyne]

I haven't had a problem with HD video lag since the 14.11 drivers. It's fine on the Omega drivers too.

There was also no HD video lag on the original releases of the 290X drivers (the first original betas didn't have HD video lag either. But the 14.7's I went to did have the HD video lag).

[mk262]

I haven't had a problem with HD video lag since the 14.11 drivers. It's fine on the Omega drivers too.

There was also no HD video lag on the original releases of the 290X drivers (the first original betas didn't have HD video lag either. But the 14.7's I went to did have the HD video lag).

Are you still using the patcher to hit vt1500 and use 120hz?'

edit: I updated to omega drivers, patched and did vt1500 with 120hz...no video lag! Great news!