Re: intel drmkms

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

[further update]

I wrote:
>I wrote:
>>Taylor R Campbell wrote:
>>>   Date: Mon,  8 Sep 2014 12:47:52 +0100 (BST)
>>>   From: Robert Swindells <rjs%fdy2.co.uk@localhost>
>>>
>>>   I'm still getting a blank console display at boot with i386 on a 915GM,
>>>   sources from today.
>>>
>>>I have an uncommitted workaround for a similar problem on an i945GM,
>>>which is to restore the call to i915_disable_vga in intel_modeset_init
>>>(sys/external/bsd/drm2/dist/drm/intel_display.c) and remove the call
>>>in intelfb_setconfig_task (sys/external/bsd/drm2/i915drm/intelfb.c).
>>>Can you try that and let me know whether it works?
>>
>>Doesn't make any difference, other than stopping console output sooner.
>>
>>Maybe "blank display" is the wrong description. The backlight is
>>turned on brightly then slowly fades to a pattern of narrow vertical
>>lines.
>>
>>I can start X11 and it doesn't report any errors but nothing happens
>>on the display.
>
>I tried plugging an external monitor into this laptop and it worked
>fine, including detecting the correct resolution to use, the
>resolution listed for intelfb0 was wrong when just using the built in
>LCD.

From adding some debug, the driver isn't able to read the EDID for the
LCD panel via i2c, it can read one for an external monitor though on
different pins.

A kernel built with 6.99.43 works on this machine but I can't see what
has changed since then that is causing the problem.