| Summary: | i915.fastboot=1, external TFT switches off | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Product: | DRI | Reporter: | Marco Leise <marco.leise> | ||||||||||
| Component: | DRM/Intel | Assignee: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||||||||
| Status: | CLOSED INVALID | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||||||||
| Severity: | enhancement | ||||||||||||
| Priority: | medium | CC: | intel-gfx-bugs | ||||||||||
| Version: | unspecified | ||||||||||||
| Hardware: | Other | ||||||||||||
| OS: | All | ||||||||||||
| Whiteboard: | |||||||||||||
| i915 platform: | HSW | i915 features: | display/Other | ||||||||||
| Attachments: |
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Created attachment 116369 [details]
Xorg.0.log
Correction: During boot, the screen stays on but nothing is displayed. It is only when entering Xorg that the screen goes to standby.
Also interestingly when I switch to a framebuffer console, not only does the screen switch on again, but when I restart the X server from there the display stays on.
Created attachment 116370 [details]
dmsg for unify-flip-modeset
This is the dmsg output for mlankhorst's unify-flip-modeset branch @ 3331a590ae16bbad65949c392ae89c28dc88f3f8
I'll buy a braille terminal if I have to continue typing commands into black screens. Joke aside, with unify-flip-modeset the screen stays black but doesn't go to sleep. There is no mode-switching happening between fb console and Xorg and as such I could not recover from the black screen by switching forth and back. (At least that's what I believe happened.)
Created attachment 116371 [details]
dmesg for unify-flip-modeset
Sorry, I booted with the wrong kernel parameters. This is the correct dmesg log. The screen stays on and black even in Xorg. So I assume no mode switch is happening between console fb and Xorg. This time I got 'clever' and unplugged the TFT and reconnected it, so it got reinitialized and showed me an image. So the problem could be solved by a special hardware flip switch in the HDMI cable that interrupts the connection between gfx card and monitor for a moment. Whenever you boot your computer you flip the switch and the image shows! But a software solution is still preferred.
i915.fastboot module parameter is gone, please file a new bug if the problem persists with recent kernels. Thanks for the report. |
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Created attachment 116366 [details] dmesg Notebook: TOSHIBA Sattelite M50-A-11L Chipset: Intel 8 Series, Haswell-ULT Kernel: drm-intel-nightly @ 4605bd59a9357d37054e1d9cf0345a73b6743df4 When booting with fastboot=1, the external monitor, a 1280x1024 TFT, is switched off and stays off in Xorg. Switching to a framebuffer console switches the TFT on, but going back to X switches it off again.