Bug 342115 – sys-kernel/gentoo-sources-2.6.36: Console not working on eDP with kernel mode setting

• Product: Gentoo Linux
• Status: RESOLVED NEEDINFO

[Description mikopp 2010-10-22 05:55:29 UTC]

I have an Intel Arrandale (Dell e4310) system. I upgraded from kernel 2.6.35 because the internal display flashed or flickered every half minute and it came faster then longer the notebook ran. external screens are fine. 2.6.36 has a lot of fixes for eDP.
After the upgrade the console goes blank during boot at the time when the kernel switches into higher resolution. Once X starts it again switches resolution and the screen is back.
I can not switch to console  (F1) on the internal display, it goes blank. Switching back to X takes some seconds so I assume it switches resolution.
again external displays work fine.

When I start with no external screen the following line pops up in my dmesg


Oct 21 22:08:13 mkopp kernel: [drm] Cannot find any crtc or sizes - going 1024x768


This is not there in 2.6.35 at all. It does not show up when I boot with external screens attached, in which case the internal is off automatically.

I do get the following things only if I have the external screens attached though


Oct 22 07:40:25 mkopp kernel: [drm:ironlake_crtc_dpms] *ERROR* failed to turn off cpu pipe


Reproducible: Always

[Comment 1 mikopp 2010-10-22 05:55:54 UTC]

Created attachment 251521 [details]
lspci -v autoput

[Comment 2 mikopp 2010-10-22 05:56:09 UTC]

Created attachment 251523 [details]
emerge --info

[Comment 3 mikopp 2010-10-22 05:56:25 UTC]

Created attachment 251525 [details]
/proc/config.gz

[Comment 4 Chí-Thanh Christopher Nguyễn 2010-10-23 08:14:49 UTC]

Please also attach dmesg output.

Does the situation change if you force output/resolution via the video=... kernel parameter?

[Comment 5 mikopp 2010-10-23 15:40:29 UTC]

Created attachment 251701 [details]
dmesg

[Comment 6 mikopp 2010-10-23 15:45:57 UTC]

I tried with the video parameter, see the dmesg log. I had a situation where it came back on after working with the external montior and suspending without them in between. but I cannot reproduce it so far.

BTW flickering is still there in 2.3.36 as well albeit not as bad.
in 2.6.35 it flickers (goes on and off very fast) every couple of minutes getting more frequent the longer the notebook runs until it does it every couple of seconds. in 2.6.36 it so far only happens every couple of minutes.

[Comment 7 Chí-Thanh Christopher Nguyễn 2010-10-23 18:57:27 UTC]

In the kernel log it says "video=intelfb:mode=1366x768" which is a) referring to intelfb not KMS b) not correct syntax for KMS c) does not specify an output.

It should rather be something along the lines of video=DP-1:1366x768 with maybe explicitly disabling the other outputs (see http://intellinuxgraphics.org/documentation.html for details).

[Comment 8 mikopp 2010-10-23 19:26:13 UTC]

Tried the parameter as mentioned. doesn't make a difference.

[Comment 9 Mike Pagano 2010-12-17 14:31:21 UTC]

Please post this issue upstream at http://bugzilla.kernel.org.  There's a lot of activity in this area.  They maybe interested to see you test the latest development sources (git-sources-2.6.37-rc6-r2 as of this moment)