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I just installed Ubuntu in my Acer 4820TG yesterday but everything lags. Every 5 seconds (approximately) my mouse & keyboard sticks and the screen blinks and loops.
Here is a video showing the behaviour.
[in this video I'm circling my mouse , you will see my mouse stop every 5 seconds.]
Innn
Posted 2015-05-07T12:38:30.713
Reputation: 23
2
I have Ubuntu Server and 2 variants of Ubuntu desktop installed on my Acer Aspire 4820TG. Server and one Desktop are 14.04 the other desktop is 15.04 and I do not have these issues. I think it may be something to do with the Intel Graphics and the Radeon video card. Try making it only use 'Descrete Graphics'.
-Boot up into your BIOS (f2) at startup.
-Go -> to 'Main'
-Scroll to Graphic mode and make it [Discrete].
-Save and Exit
This will make your graphics not switchable. This has seem to fix a lot of things for me. Even on windows switchable graphics was a huge problem for me. Cause BSOD all the time.
Warsum
Posted 2015-05-07T12:38:30.713
Reputation: 36
Work like a charm. what graphic "Discrete" mode use [ATI or Intel]? – Innn – 2015-05-07T14:17:30.573
Discrete uses the ATI graphics card. Hence you may suffer from battery drainage. – Warsum – 2015-05-08T15:19:25.813
1
A litte late for the party. I know that the answer above is already accepted, but I want to share my experience which might be helpful for others. The problem was something to do with ACPI. I wrote a script which solves this problem automatically: Fix-video-lag-in-linux
Obadah Hammoud
Posted 2015-05-07T12:38:30.713
Reputation: 111
Your script isn't very big. It's better to include it in the answer and leave the github link for a reference. This way it will help people even if the repository will gone. – montonero – 2019-05-11T22:07:59.960
Try installing AMD's propitiatory graphics (fglrx) driver for your GPU. Go to Additional Drivers from your dash. Select "Using Video driver for the AMD graphics accelerator from fglrx (propitiatory)" and click Apply Changes. See if this helps. – Ayan – 2015-05-07T13:09:12.840
I can't select "installing AMD's propitiatory graphics (fglrx) driver for your GPU" when I click apply its returning to default – Innn – 2015-05-07T14:18:19.710
Were you connected to the internet while installing the driver? You need an active internet connection as it will download the drivers from the internet and then install it. – Ayan – 2015-05-08T00:38:22.913