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Virtual console does not redraw #151

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johalun opened this issue Jun 12, 2019 · 10 comments
Open

Virtual console does not redraw #151

johalun opened this issue Jun 12, 2019 · 10 comments
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@johalun
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@johalun johalun commented Jun 12, 2019

Typed characters does not show up on screen until one switch VT back and forth ones. Only occurs on rare hardware or on rare occasion..

@myfreeweb

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@myfreeweb myfreeweb commented Jun 13, 2019

When? If it's after switching from a graphical display server, it might be just the vt being left in the mode that doesn't echo..

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@johalun johalun commented Jun 13, 2019

Apparently the only variable is drm-v4.16 (OK) vs drm-v5.0 (has this bug). I suspect the drm fb helper.

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@johalun johalun commented Jun 13, 2019

This happens before even starting X, when loading drm driver at virtual console.

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@myfreeweb myfreeweb commented Sep 3, 2019

I have a Kaby Lake device now, am seeing this. Switching to a new vt does redraw the screen..

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@myfreeweb myfreeweb commented Sep 8, 2019

Interesting: looks like this maybe does not happen with fastboot enabled? (need to retest, I'm actually not sure)

(But fastboot breaks backlight on my new laptop (on Linux too, it's a known thing) haha)

and sometimes quitting from a GUI display server restores refresh too

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@javashin javashin commented Sep 8, 2019

fastboot is fixed on 5.2.X
the backlight issue

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@javashin javashin commented Sep 8, 2019

also mpv cant play any video on the KMS Drm console its useless too slow , maybe is this related ?

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@myfreeweb myfreeweb commented Sep 8, 2019

no, this is about vt (virtual terminal), userspace applications that use DRM are fine

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@javashin javashin commented Sep 8, 2019

yes on Vt kms drm >> after load kldload i915kms and use on the same console tty vt no X > mpv -vo=drm foo.mp4 = very slow reproduction of video media , too slow means unusable. unwatchable

@wulf7

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@wulf7 wulf7 commented Nov 8, 2019

Setting compat.linuxkpi.i915_enable_psr boot loader parameter to 0 workarounds at least "VT redraw" issue to me.
fastboot does not work with suspend/resume on my laptop.
P.S. 'does not work' means VT redraw is stopped after wakeup

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