Bug 60728

Summary: [pnv 3.7] No output on VGA
Product: DRI Reporter: eeemsi
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED WONTFIX QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: jrnieder
Version: XOrg git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
lspci -vnn
none
drm.debug=6
none
refresh dmesg video=LVDS-1:d
none
refresh Xorg.log none

Description eeemsi 2013-02-12 13:59:20 UTC 
Created attachment 74681 [details]
lspci -vnn

an output via lvds is offered. the mainboard(elitegroup TIGT 1) however does only have a vga connector. according to the manufacturer(http://www.ecs.com.tw/ECSWebSite/Product/Product_Detail.aspx?DetailID=1094&CategoryID=1&DetailName=Feature&MenuID=17&LanID=0) there is an optional lvds connector.

using debian there are currently two different behaviours:
- the resolution is limited to 1024x768 (linux-image-3.2.0-4-amd64/testing)
- no output via vga (linux-image-3.7-trunk-amd64/experimental)

both times xserver-xorg-video-intel(2.20.14-1) from debian experimental was used
Comment 1 Chris Wilson 2013-02-12 14:23:07 UTC 
We need your dmesg from boot, preferably with the drm.debug=6 kernel parameter.
Comment 2 eeemsi 2013-02-12 14:54:11 UTC 
Created attachment 74689 [details]
drm.debug=6
Comment 3 Chris Wilson 2013-02-12 15:02:11 UTC 
Ok, so there is definitely an LVDS header on that board that is alive and kicking. The manufacturer has chosen to also declare the LVDS as present through the VBT. I don't think we can apply a quirk here as there will be identical mainboards with a valid LVDS.

There is nothing you can do but add video=LVDS-1:d to your kernel parameters.

s/WONTFIX/CANTFIX/
Comment 4 Daniel Vetter 2013-02-12 15:05:01 UTC 
That kernel option should also give you working VGA again (it seems to pick a different resolution in 3.7 which your screen probably doesn't like). If that (or manually adjusting the resolution with xrandr/xorg.conf) doesn't bring VGA back, please reopen. Since that should be a bug we very well can fix ;-)
Comment 5 Chris Wilson 2013-02-14 13:44:40 UTC 
You need to refresh the dmesg and Xorg.log after applying the video=LVDS-1:d
Comment 6 eeemsi 2013-02-14 14:42:55 UTC 
Created attachment 74821 [details]
refresh dmesg video=LVDS-1:d
Comment 7 eeemsi 2013-02-14 14:46:17 UTC 
Created attachment 74822 [details]
refresh Xorg.log
Comment 8 Chris Wilson 2013-02-14 14:55:17 UTC 
Does the BIOS ever light up the VGA monitor?
Comment 9 eeemsi 2013-02-14 15:08:55 UTC 
yes, the vga monitor gets lighted up by the bios.
Comment 10 Daniel Vetter 2013-02-14 18:58:49 UTC 
So to clarify: With the lvds quirk applied to the kernel cmdline, VGA still doesn't light up properly? The kernel now again selects the right mode ...
Comment 11 eeemsi 2013-02-14 23:21:44 UTC 
(In reply to comment #10)
> So to clarify: With the lvds quirk applied to the kernel cmdline, VGA still
> doesn't light up properly? The kernel now again selects the right mode ...

using LVDS-1:d seems to work fine(e.g. correct resolution)
Comment 12 Daniel Vetter 2013-02-15 17:48:03 UTC 
Ok, setting back to CANTFIX since there's not really anything we can do here :(

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