Bug 107649 - Fails to restore text mode after broken three-output X configuration
Summary: Fails to restore text mode after broken three-output X configuration
Status: CLOSED WORKSFORME
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: XOrg git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard: Triaged
Keywords:
Depends on:
Blocks:
 
Reported: 2018-08-21 17:07 UTC by Simon Richter
Modified: 2018-10-11 15:21 UTC (History)
1 user (show)

See Also:
i915 platform: IVB
i915 features:

Attachments
X log file from server invocation causing the error (50.71 KB, text/plain)
2018-08-21 17:07 UTC, Simon Richter 		no flags Details
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Description Simon Richter 2018-08-21 17:07:46 UTC 
Created attachment 141222 [details]
X log file from server invocation causing the error

There is a bug in the X server that configures a three-output setup (LVDS, DP, HDMI) if the monitors on HDMI and DP support the same timings (this is correct if the DP output is used in HDMI compatibility mode, but incorrect for DP mode).

When the X server shuts down afterwards, none of the outputs (not even the LVDS) work.

Configuration is a Fujitsu LifeBook E782 with HD4000 graphics, using the internal panel and the DP and DVI outputs on the docking station.
Comment 1 James Ausmus 2018-08-22 19:17:29 UTC 
Please try to reproduce the error using drm-tip (https://cgit.freedesktop.org/drm-tip) and kernel parameters drm.debug=0x1e log_buf_len=4M, and if the problem persists attach the full dmesg from boot.
Comment 2 Lakshmi 2018-09-03 06:59:15 UTC 
Reporter, were you able to reproduce this issue with latest drm-tip?
Comment 3 Lakshmi 2018-10-11 15:21:47 UTC 
No feedback from more than a month.
closing as resolved works for me.

Please re-open if issue persists with latest drm-tip https://cgit.freedesktop.org/drm-tip 

Send dmesg from boot with kernel parameters drm.debug=0x1e log_buf_len=4M. This information is needed for investigating.

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