[Bug 104330] No display on my monitor if i plug in the VGA cable after entering os

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104330

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEEDINFO

--- Comment #33 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Liuxiaoqian from comment #31)
> Created attachment 139295 [details]
> dmegs with drm.debug=0x1e log
> 
> The attachment is the dmesg log. I have started my compute twice. The first
> one is the log without the VGA cable. And the second one is the log with the
> VGA cable. Please compare. Thank you.

That log has multiple boots in it, so it's super hard to see what's going on.
Furthermore it doesn't have any drm debugs in it for some reason. I did see
some of the boots did have the drm.debug=0x1e in there, but not all. I don't
know why the debug prints weren't present in the actual log though. Possibly
due to it being captured via syslog/something. Try to grab the log directly
with the 'dmesg' command.

Also please remove all i915 module parameters from whatever modprobe config
file you're using. They are either useless, or actually unsafe and we don't
want waste time debugging issues caused by them:
"May  3 15:39:46 localhost kernel: i915: unknown parameter 'enable_rc6' ignored
May  3 15:39:46 localhost kernel: Setting dangerous option enable_fbc -
tainting kernel
May  3 15:39:46 localhost kernel: i915: unknown parameter 'lvds_downclock'
ignored
May  3 15:39:46 localhost kernel: i915: unknown parameter 'semaphores' ignored"

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