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Monq
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PostPosted: Wed Mar 20, 2019 11:47 am    Post subject: Screen not waking up after suspending Reply with quote

After I suspend my computer with pm-suspend and wake it up, my monitor never wakes up. Where can I start looking to try to debug it?
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Verdazil
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PostPosted: Wed Mar 20, 2019 11:54 am    Post subject: Re: Screen not waking up after suspending Reply with quote

Monq wrote:
After I suspend my computer with pm-suspend and wake it up, my monitor never wakes up. Where can I start looking to try to debug it?
Such problems are usually associated with improper operation of video drivers. What is your videocard and what driver is used?
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Zucca
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PostPosted: Wed Mar 20, 2019 12:00 pm    Post subject: Reply with quote

I remember having similar problem some time back...
Try ctrl+alt+F<n> to change to virtual terminal. Then switch back to your graphical session.

If that works you can create a suspend-hook-script which uses chvt for example to switch back and forth after waking from suspend. It's ugly, I know. There might be better way to "refresh" graphical session.
But first you should test if changing to virtual terminal and back works.
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Monq
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PostPosted: Wed Mar 20, 2019 12:03 pm    Post subject: Re: Screen not waking up after suspending Reply with quote

Verdazil wrote:
Monq wrote:
After I suspend my computer with pm-suspend and wake it up, my monitor never wakes up. Where can I start looking to try to debug it?
Such problems are usually associated with improper operation of video drivers. What is your videocard and what driver is used?


I've got an AMD R9 290 and I'm using the amdgpu driver.

Zucca wrote:
I remember having similar problem some time back...
Try ctrl+alt+F<n> to change to virtual terminal. Then switch back to your graphical session.

If that works you can create a suspend-hook-script which uses chvt for example to switch back and forth after waking from suspend. It's ugly, I know. There might be better way to "refresh" graphical session.
But first you should test if changing to virtual terminal and back works.


It happens even if I haven't started Xorg yet, this is, even if I'm only using a tty. So I assume it's got nothing to do with Xorg.
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Zucca
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PostPosted: Wed Mar 20, 2019 12:19 pm    Post subject: Re: Screen not waking up after suspending Reply with quote

Monq wrote:
It happens even if I haven't started Xorg yet, this is, even if I'm only using a tty. So I assume it's got nothing to do with Xorg.
I never got suspend to propely working if not inside graphical session. The screen(s) always remained black if I tried to suspend from vt.
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Monq
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PostPosted: Wed Mar 20, 2019 12:21 pm    Post subject: Re: Screen not waking up after suspending Reply with quote

Zucca wrote:
I never got suspend to propely working if not inside graphical session. The screen(s) always remained black if I tried to suspend from vt.

The same thing happens if I suspend and wake up inside Xorg. In any case I expect suspend to work fine using a tty too.
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Zucca
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PostPosted: Wed Mar 20, 2019 12:25 pm    Post subject: Reply with quote

But did switching the vt do anything?
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Monq
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PostPosted: Wed Mar 20, 2019 12:25 pm    Post subject: Reply with quote

Okay, so... the problem went away after updating to Linux 5.0.3. Now my computer wakes up properly both in a tty and in Xorg. Case closed. :-)

Thanks for your help.
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