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: http://pastebin.com/977j4mzV
lsmod after install: http://pastebin.com/PdfCtjfj
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
Best Answer
Resolved.
Edit grub config:
Change to:
Update grub:
Reboot, and it works fine.