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[CHT] Screen remains black after opening lid on Asus T102HA

Submitted by Ambroz Bizjak

Assigned to Intel GFX Bugs mailing list

Link to original bug (#102343)

Description

Created attachment 133649
System log (includes kernel log)

On Asus T102HA the display works at first, when I close the lid it turns off but never turns back on when I open the lid. There is no backlight and I also do not see anything displayed when looking at the screen under external illumunation. This happens every time, with and without X running.

Backlight control (/sys/class/backlight/intel_backlight/brightness) otherwise works before this issue occurs, after this changing the brightness has no visible effect.

This happens regardless of whether the keyboard is electrically attached via its USB connection. It is possible to "close" the lid (keyboard) without attaching it as the open/closed detection uses a different mechanism. The logs attached are with the keyboard not attached as that avoids some USB related spam.

Attached are:

  • The system log, produced using drm.debug=0x1e . It includes kernel and Xorg logs, and "Lid closed" and "Lid opened" from logind can also be seen.
  • intel_reg dump --all

I could not dump VBIOS, I get Input/Output error when trying to "cat" the rom and an error in dmesg (i915 0000:00:02.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xa243).

Kernel version: 4.13.0-rc4
Distribution: NixOS (unstable)

**Attachment 133649**, "System log (includes kernel log)":
system.log
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