Bug 58769

Summary: [hsw] DP training failure upon DPMS on
Product: DRI Reporter: EvaWang <evawang>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: major    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
dmesg.log none

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

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.

Dmesg:
[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
Xorg1.12.0
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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