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When I boot from Ubuntu 13.10 64 bit live from USB, then secondary monitor on HDMI works fine. After installing Ubuntu, the secondary monitor on HDMI port doesn't work. If I reboot with live Ubuntu, then monitor works again.

Is it a bug? Is there a patch or a workaround?

Lenovo y510p notebook, Intel HD4600 VGA lsmod after live boot: lsmod after install:

UPDATE: lshw -c video | grep configuration

When I boot from Live USB: configuration: driver=i915 latency=0 (dual monitor works)

When I boot from SSD: configuration: latency=0

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What did you do to enable the monitor? Have you been to the displays menu and tried configuring it? – LiveWireBT Jan 18 '14 at 0:29
The secondary monitor doesn't show up in display menu from install, but I see it when I boot from live USB. – István Pató Jan 18 '14 at 9:43
I made an update. I don't know why not shown "driver=i915" when I boot my SSD... but shown when boot from Live USB. lsmod shown that i915 has been loaded in both cases. – István Pató Jan 18 '14 at 12:17
up vote 0 down vote accepted


Edit grub config:

sudo su
nano /etc/default/grub

Change to:

GRUB_CMDLINE_LINUX_DEFAULT="quite splash i965.modeset=1"

Update grub:


Reboot, and it works fine.

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