[Bug 1767808] Re: "drm timed out" with driver i915 + Intel Mobile GM965/GL960 Integrated Graphics with Kernel 4.15

Same bug here, with Ubuntu 16.04 and kernel 4.15.0-43 (LTS enablement
stack) using Intel Corporation Mobile GM965/GL960 Integrated Graphics
Controller (primary) (rev 0c) on DELL inspiron 1525.

Tried with liveusb ubuntu 18.04.1 and same symptoms.

Under Ubuntu 16.04, adding "video=SVIDEO-1:d" solved the problem !

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https://bugs.launchpad.net/bugs/1767808

Title:
"drm timed out" with driver i915 + Intel Mobile GM965/GL960 Integrated
Graphics with Kernel 4.15

Status in linux package in Ubuntu:
Confirmed

Bug description:
With Ubuntu 18.04 + Kernel 4.15, at boot time there are many periods when the boot freezes before the timeout of 10 seconds with Intel Mobile GM965/GL960 Integrated Graphics (driver i915).
In total it is 198 seconds that are lost in these timeouts during boot, more than 3 minutes!

Regression is present since linux kernel 4.8 (with Ubuntu 16.04).

To fix, explicitly disable the port with an i915 module setting with video=SVIDEO-1:d in the kernel command line parameter in the bootloader.
1/ sudo gedit /etc/default/grub
2/ add "video=SVIDEO-1:d" to "GRUB_CMDLINE_LINUX_DEFAULT" line
3/ sudo update-grub

After applying this, the system boots up much faster, there are no
"drm ... timed out" messages.

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