Lenovo y510p with HDMI monitor (RESOLVED)

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

1 Answer

Resolved.

Edit grub config:

sudo su
nano /etc/default/grub

Change to:

GRUB_CMDLINE_LINUX_DEFAULT="quite splash i965.modeset=1"

Update grub:

update-grub

Reboot, and it works fine.