Hello, I was redirected here from the archlinux IRC chat, hoping that this is the correct place to file this bug. I recently updated my archlinux kernel from 4.6 to 4.7 and my laptop screen is fully dead now (backlight still on). I am using an intel cpu/gpu 4000 with the builtin kernel drivers (no additional intel driver of arch). This monitor is displayed in the xfce monitor config though. If i switch to tty1 there is no output at all on the laptop. My 2 external displays work. If I turn one off, this doesnt affect the laptop screen. When booting I need to unlock my root partition (encrypted). This message is actually displayed on the laptop screen at the initial step when systemd was loaded. I am using EFI, but I can also boot MBR. Switching back to 4.4 LTS kernel solves this problem. My hardware is the following: model name : Intel(R) Core(TM) i7-4702MQ CPU @ 2.20GHz Its an Fujitsu Lifebook E744. dmesg: https://gist.github.com/NicoHood/3e515f96b522fc1ae0d6a781ce00ff58 Let me know of any additional information that I should provide. I did not open a bug anywhere else yet, as people directed me here first. In the meantime I will try the mainline kernel and report results back.
Also applies to 4.8 rc1 (built AUR package linux-mainline myself)
I just observed this on my IvyBridge laptop too using linux-next. I use LILO... it does the modeset (i915 is builtin) and then shows nothing. I can't blindly login or ssh but there's some HDD activity (?).
Could you provide dmesg log with the following options, please drm.debug=0x1e log_buf_len=1M this provides a lot more debugging information to figure out what's going on with the driver.
Created attachment 125979 [details] dmesg with drm.debug=0x1e log_buf_len=1M Kernel params: drm.debug=0x1e log_buf_len=1M
I'm not seeing this anymore on IvyBridge 4.8.0-rc3-next-20160825. Sorry for the delay, and the noise.
I still got the error with 4.8 rc3: Linux arch 4.8.0-rc3-mainline #1 SMP PREEMPT Sat Aug 27 09:23:29 CEST 2016 x86_64 GNU/Linux
4.7.5-1 and 4.8 (from AUR) solve this issue.
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