graphics performance drop after system sleep

[sse]

After system sleep (suspend to ram / standby) I experience a severe drop in graphics performance, e.g. sluggish scrolling / GUI animations.

Occurs even if I haven't connected a display via displaylink.

After reboot, performance is normal.

My system specs:

10.7 driver beta 3
Mac OS X Lion 10.7 Build 11A2063
MacBookAir 4,2 (Core i7 1.8GHz, Intel HD Graphics 3000)

[ChristianP]

Originally Posted by sse

After system sleep (suspend to ram / standby) I experience a severe drop in graphics performance, e.g. sluggish scrolling / GUI animations.

Occurs even if I haven't connected a display via displaylink.

After reboot, performance is normal.

My system specs:

10.7 driver beta 3
Mac OS X Lion 10.7 Build 11A2063
MacBookAir 4,2 (Core i7 1.8GHz, Intel HD Graphics 3000)

Could you check using the Activity monitor app the DisplayLinkManager process CPU usage when you notice a performance drop? Could you also please use the debug tool here http://www.displaylink.com/support/ticket.php?id=269 and post the output file? Thanks

[sse]

Thanks for your reply.

I conducted the tests without a DisplayLink adapter connected, as the problem occurs either way, maybe you can rule out some sources this way. If you want me to repeat the tests with an adapter connected, I can do so.

I only see the process "DisplayLinkUserAgent", of which no increase in CPU usage can be noticed after system sleep and the performance drop (about 0.2% before and after)

[ChristianP]

Thanks for the debug information. Unfortunately no weird DL-related activity are logged after wakeup.
Could you please try to uninstall and reinstall the driver 1.7b3 (we had a similar issue solved just after reinstalling the driver)? Just to be sure, check if the issue is not reproducible after uninstalling the driver. Thanks

[MJedi]

I have been experiencing the exact issue on my 2011 MacBook Air with the beta 3 driver. I have uninstalled the driver, and the performance after the MBA wakes up is back to normal. When I reinstall the beta 3 driver, the same problem comes back.

[ChristianP]

Originally Posted by MJedi

I have been experiencing the exact issue on my 2011 MacBook Air with the beta 3 driver. I have uninstalled the driver, and the performance after the MBA wakes up is back to normal. When I reinstall the beta 3 driver, the same problem comes back.

Thanks for your report. It sounds like a possible compatibility issue of our kernel extension with the 2011 MacBookAir models. We're going to investigate the issue.

[patrickdempsey]

I am certainly having the same issue on version 3 and 4 of the beta.

After the Macbook goes to sleep (with the DisplayLink Beta 4 for the 1.7 installed), it is then slow on scrolling/zooming graphics upon resuming from sleep. The Activity Monitor isn't being overtaxed...I have the fully maxed out Macbook Air 1.8 with 4GB ram and the % of CPU usage never going much above 12% when scrolling in Safari.

It is strange because it seems to primarily impact Safari and Chrome's ability to scroll smoothly and quickly. PDFs and Word documents are also impacted in their scrolling, albeit less than web pages. Moving windows around on the screen and playing movies does not appear to be impacted at all. Ironically, scrolling on a page with an actively playing flash video fixes the problem...and it is also fixed when I pause the flash video...but it goes back to the same jerky and slow web scrolling when I go back to a regular webpage. For example, scrolling up and down when 720p flash video from Vimeo or Youtube is being played in the browser window is butter smooth...but going back to the home page of Vimeo or Youtube makes the jerky/slow scroll/zoom return immediately.

The problem persists even after disconnecting the displaylink and even when on the Macbook's native screen only.

The problem is fully resolved by a reboot.

After another sleep session, the problem returns with the same symptoms as listed above.

If I uninstall the Displaylink Driver, the problem never appears, even after sleep sessions. The problem returns upon reinstalling the Displaylink driver.

This leads me to believe that it is definitely being cause by the Displaylink driver. It is not a CPU resource issue or even a purely graphics resource issue because the problem is temporarily resolved by scrolling on a page that has active playback of flash video. Don't know much about this type of technology, but it would seem that resources are being directed AWAY from scrolling unnecessarily after sleep when this driver is installed.

I can do a video and send it in of the symptoms if requested...the problem can be replicated 100% of the time under the conditions above.

Patrick Dempsey
Processor 1.8 GHz Intel Core i7
Memory 4 GB 1333 MHz DDR3
Graphics Intel HD Graphics 3000 384 MB
Software Mac OS X Lion 10.7.1 (11B2118)

[ChristianP]

Thanks Patrick for the detailed report. We are still trying to replicate and understand the issue. I assume the issue happens even if the adapter is not plugged in, is that correct?Could you please use the debug tool here http://www.displaylink.com/support/ticket.php?id=269, collect the info after seeing the scrolling issue and post the output file? A video of the scrolling issue would also help. Thanks

[patrickdempsey]

Here is a follow-up video where I show the examples of the scrolling problem that occurs after awaking from sleep.

http://www.youtube.com/watch?v=oZYWMxAEPZg

[patrickdempsey]

I have also created a log file "DisplayLinkInformation.zip"...please let me know where I should post/send the log file.