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
Could you help to update the issue status?
If you need any information, please let me know!
In theory, Haswell is now in much better working order.
Can you please test whether disabling the ACPI backlight ala https://patchwork.kernel.org/patch/2697681/ fixes the issue?
Presuming one of the many HSW dp fixes actually took effect.