What happens :
(1) video freezes after a few seconds of idling while audio remains intact.
(2) video resumes if I move the mouse.
What I tried :
(1) right click on a video -> "settings" -> uncheck "enable hardware acceleration"
(2) Chromium. (I usually use Firefox.)
(3) sudo pm-powersave false
(4) removed and reinstalled flash plug-in.
sudo apt-get autoremove flashplugin-installer
sudo apt-get autoremove flashplugin-nonfree
sudo apt-get install flashplugin-installer
(5) installed Flash-Aid and used it. (Both stable and beta options.)
No improvement so far.
UPDATE (More Info) :
sudo lshw -c display
*-display:0
description: VGA compatible controller
product: Mobile GM965/GL960 Integrated Graphics Controller (primary)
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 03
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:44 memory:f0000000-f00fffff memory:d0000000-dfffffff ioport:1800(size=8)
*-display:1 UNCLAIMED
description: Display controller
product: Mobile GM965/GL960 Integrated Graphics Controller (secondary)
vendor: Intel Corporation
physical id: 2.1
bus info: pci@0000:00:02.1
version: 03
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: latency=0
resources: memory:f0100000-f01fffff