I helped fix sleep-wake hangs on Linux with AMD GPUs • Hacker News Board

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#11

Post by Asmod4n » Mon, Feb 17, 2025, 6:03 PM UTC

> On my laptop, I opened a terminal and ran sudo minicom --device /dev/ttyUSB0 --baudrate 115200 to monitor the computer over serial. In addition to saving logs

You can just use screen for that and have a working terminal with color support et al.

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#12

Post by [deleted] » Mon, Feb 17, 2025, 6:19 PM UTC

[deleted]

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#13

Post by 0xTJ » Mon, Feb 17, 2025, 6:20 PM UTC

Very excited to see 6.14 hit Arch! Hanging around sleep (with symptoms that sound like what's described in the write-up) has been the one persistent occasional issue, so I'm hoping that this fixes what I'm seeing.

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#14

Post by an_ko » Mon, Feb 17, 2025, 6:21 PM UTC

yellow_lead wrote: post #7

I have an Nvidia GPU and a sporadic crash (black screen) with no logs on Linux. I suspect it's a driver issue too. Going to try some of these tips to enable the debug shell, but I'm not sure if they'll be effective. Anyone have other tips for this type of thing? I did try upgrading drivers/kernels already

Run a memtest. Graphics cards usually crash badly when given invalid data, which can happen sporadically if you have bad RAM.

If memtest shows a specific memory region as failing, swap out sticks to check which it is, and buy a new one. (Or if you're on a tight budget, you can disable that region with kernel boot options.)

If memtest gives errors in lots of places, might be a bad overclock. Loosen timings or give it more voltage.

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#15

Post by progforlyfe » Mon, Feb 17, 2025, 6:23 PM UTC

Extremely high level genius stuff -- nice work and thank you for your efforts!

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#16

Post by sabujp » Mon, Feb 17, 2025, 6:30 PM UTC

This is amazing work! If folks have ever wondered why suspend is so difficult to get working on linux and why debugging it is equally difficult, this is a single datapoint with lots of information about all the things that can go wrong. Even now I have a thinkpad P1G4 where the fans won't turn off automatically unless I turn them off before going into suspend. Recently I also started having crackling issues with my bluetooth headphones after resuming from suspend and had to disable node suspension there also (https://wiki.archlinux.org/title/PipeWire#Noticeable_audio_d...).

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#17

Post by VMG » Mon, Feb 17, 2025, 6:44 PM UTC

jorvi wrote: post #3

> Through some digging, I found that when a desktop enters S3 sleep, the system cuts power to PCIe GPUs I am not sure how correct this assumption is. S3 is supposed to cut power to everything but RAM, but for example Gigabyte Aorus motherboards are notorious for an NVMe SSD sleep bug that randomly prevents the system from properly sleeping or waking. This is fixed by adding the following udev rule: # Generic PCIe fix…

As somebody with an Aorus motherboard who has probably burned a few kWh on this issue, I was really excited to try these solutions - no luck. Thank you anyway!

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#18

Post by Voultapher » Mon, Feb 17, 2025, 6:52 PM UTC

Since a couple Linux versions something around 6.10 IIRC I've had it where my Nvidia system wakes into a black screen, but with a cursor and alt shells work, specifically KDE Plasma seems bugged here, but they say it's a kernel issue, or at least there are dozens of separate issues open about this kind of bug and it's rather annoying that I can't put my machine to sleep.

If anyone has ideas what could fix this I'd really appreciate it. The machine is dual booted with Windows, and there sleep works without issue, so it's clearly possible, as it was for years before that on Linux as well.

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#19

Post by jph » Mon, Feb 17, 2025, 6:57 PM UTC

Your work will help me on a Framework AMD laptop with the GPU extension and dual boot Linux/Windows. May I donate to you or to your favorite charity? My contact info is in my profile.

Re: I helped fix sleep-wake hangs on Linux with AMD GPUs

#20

Post by bmicraft » Mon, Feb 17, 2025, 6:58 PM UTC

an_ko wrote: post #14

yellow_lead wrote: post #7

I have an Nvidia GPU and a sporadic crash (black screen) with no logs on Linux. I suspect it's a driver issue too. Going to try some of these tips to enable the debug shell, but I'm not sure if they'll be effective. Anyone have other tips for this type of thing? I did try upgrading drivers/kernels already

Run a memtest. Graphics cards usually crash badly when given invalid data, which can happen sporadically if you have bad RAM. If memtest shows a specific memory region as failing, swap out sticks to check which it is, and buy a new one. (Or if you're on a tight budget, you can disable that region with kernel boot options.) If memtest gives errors in lots of places, might be a bad overclock. Loosen timings or give it…

> If memtest shows a specific memory region as failing, swap out sticks to check which it is, and buy a new one. (Or if you're on a tight budget, you can disable that region with kernel boot options.)

Honestly, I'd always do that as the first option. In most cases you can still get years of life out of that stick of ram (but do check regularly, like after a week and then double the interval every time if it didn't get worse).