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I have some issues with my Ubuntu 13.04 upgrade.

From time to time everything on the screen except mouse pointer freezes forever. Ctrl+Alt+F1 (and so on) still works: if there is animation on screen, I could switch to console screen then back to primary screen to see updated animation that freezes on the new frame.

Using Adobe Flash makes freeze come earlier, connecting large screen through HDMI or playing some Steam games speeds it up too (Adobe Flash + HDMI screen + Clojure kills my laptop instantly :) ).

Looks like something is buggy in hardware acceleration.

Is there a way to locate this bug more precisely to send to Canonical more detailed bugreport? Or is this issue already solved?

Tech info:

Processor: Intel® Core™ i5-2410M CPU @ 2.30GHz × 4

Graphics: Intel HD Graphics 3000


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marked as duplicate by Jorge Castro, coteyr, Uri Herrera, user68186, Raja May 20 '13 at 16:14

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Why is this being marked as a duplicate? And what is the duplicate question? – toobsco42 Jun 11 '13 at 22:47
up vote 3 down vote accepted

Have you tried this command:

sudo adduser $USER video 

then log out and login again.

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That worked for me! :) – victorhqc Jun 13 '13 at 5:35
Well, after a week of testing I could say that problem is mostly solved. Thanks a lot! – Stanislav Cherenkov Jul 21 '13 at 22:12
Technically, how would this work? I'm curious. – Craig McQueen Jan 14 '14 at 6:21
Technically speaking, it just gives you the authority to access the device files in /dev/dri which has the device files for your video card. The freezing part maybe caused by the use of software rendering which uses the cpu as the backup video card because the system failed to access it directly or the driver is not installed or found or not working. In that mode the cpu does almost the graphics processing work that supposedley is just for the video card. This would make the cpu work harder and may freeze when using some graphics intensive programs or games. Please correct me if I am wrong. – user128712 Jan 14 '14 at 10:32

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