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sudeepn / Lenvyx

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How do you switch between the integrated and discrete graphics? #4

Closed svaxy closed 5 years ago

svaxy commented 9 years ago

Did you manage to get the switchable graphics work 100%? I'm trying to get the ATI/AMD Radeon card working to be able to connect an external display, but didn't have any luck.

Using Ubuntu 14.04

jarthod commented 9 years ago

I managed to get it working using vga_switcheroo before 14.04 but I'm not sure for 14.04. I ended up just wanting to disable the ATI card for battery life, I almost never tried to use it. Have you tried the commands in switchable-graphics.conf ? there is one commented to switch to discrete graphics, it should be something like (as root):

# Turn ON the unused card to ensure we can switch
echo ON > /sys/kernel/debug/vgaswitcheroo/switch

# Switch to the integrated graphics (low power)
# echo DIGD > /sys/kernel/debug/vgaswitcheroo/switch

# Switch to the Discrete Graphics (high power)
echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch

# Turn OFF the unused card to save power
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

You can always use sudo cat /sys/kernel/debug/vgaswitcheroo/switch to know current status.