Comment # 2 on bug 1086748 from Ivan Zatravkin

>> Reporter, do you have the same symptoms as bug 1086199?

No, this image scales up/down just fine. But UI hardware acceleration causes
screen to freeze and playback in other tabs to stop for fraction of second. 

For example, hovering mouse over youtube video displays controls (opacity
transition), during which interface often freezes for a split second. Also, CPU
load hovering mouse in and out of video causes very high CPU load: 20%
according to kde system monitor and 180% according to chrome task manager.
Also, chrome task manager reports 36% CPU usage for GPU process. 


Also to note, this bug may be caused by wrong hw state. After first stuttering,
I can hover mouse over youtube videos or do some other hw-accelerated UI
transitions without any freezes for some time. I recently experienced UI
stutter, this may have caused image to scale up/down without freezes.

>> Hmm do you happen to know the last working driver version?

I am not 100% sure, but it seems to be NVIDIA-Linux-x86_64-384.111. I
downloaded it after trying to fix UI freezes for one day and used it since. I
tried to switch to driver from official repository last weekend, UI still would
freeze, so I reported this bug.