Bug 58769 - [hsw] DP training failure upon DPMS on
Summary: [hsw] DP training failure upon DPMS on
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: Other Linux (All)
: medium major
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
Depends on:
Reported: 2012-12-26 06:09 UTC by EvaWang
Modified: 2017-07-24 22:59 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

dmesg.log (33.29 KB, text/plain)
2012-12-26 06:09 UTC, EvaWang
no flags Details

Description EvaWang 2012-12-26 06:09:06 UTC
Created attachment 72120 [details]

GDM can't show and screen freeze after screen saver and turn off backlight command("gnome-screensaver-command -l;sleep 3;xset dpms force off")
But, if you press Ctrl+Alt+F3(tty3) then press Ctrl+Alt+F2(tty0), GDM will show.

[11577.928164] [drm:intel_dp_set_link_train] *ERROR* Timed out waiting for DP idle patterns
[11577.928167] [drm:i915_write32] *ERROR* Unknown unclaimed register before writing to 64040

Expected output: it enter to screensaver and turn off backlight, then press any key to resume system, it should shows GDM.

This only happens on Haswell chipset, but it is OK on Ivybridge.
Kernel 3.7.0 added intel 3.7.0 branch kernel patch
Model: Lenovo Y410 Y510
Comment 1 EvaWang 2013-01-26 09:48:34 UTC
Could you help to update the issue status? 
If you need any information, please let me know!
Comment 2 Chris Wilson 2013-05-01 19:40:08 UTC
In theory, Haswell is now in much better working order.
Comment 3 Chris Wilson 2013-06-12 12:32:58 UTC
Can you please test whether disabling the ACPI backlight ala https://patchwork.kernel.org/patch/2697681/ fixes the issue?
Comment 4 Chris Wilson 2013-06-30 08:43:01 UTC
Presuming one of the many HSW dp fixes actually took effect.

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