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Lebkoungcity
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PostPosted: Sun Apr 05, 2020 9:56 pm    Post subject: gentoo-sources-5.4.28:black lines w/ Mobility Radeon 7500 Reply with quote

Hello,

when sys-kernel/gentoo-sources-5.4.28 became stable for ~x86 I updated my kernel. But since then X is full of short horizontal black lines.
See here:
https://ibb.co/ZzSS1QN
(That was the moment I tried to take a snapshot but because of these lines I couldn't recognize the buttons anymore so I took a photo...)

I already rebuild xorg-server but that didn't change it.
I can boot the old kernel (sys-kernel/gentoo-sources-4.19.97) and graphics are fine again.
There are no [specific] errors or warnings in Xorg.log.

So, what is going on here?

Greetings,
Andy

ThinkPad R40 with RV200/M7 [Mobility Radeon 7500]
in make.conf: VIDEO_CARDS="radeon r100"

-------

[edit]
Here are some data gathered with kernel 5.4.28:

Xorg.0.log
https://pastebin.com/SHBcqxbW

dmesg
https://pastebin.com/xjGCRh3g

config-5.4.28-gentoo
https://pastebin.com/1SW4DNyp

Just drop a note if you'd want to see more!
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Lebkoungcity
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PostPosted: Wed Apr 08, 2020 11:31 am    Post subject: Reply with quote

No-one? I'd appreciate any help!
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molletts
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PostPosted: Wed Apr 08, 2020 12:20 pm    Post subject: Reply with quote

Have you tried playing with the power management options detailed at https://www.x.org/wiki/RadeonFeature/#kmspowermanagementoptions?

It looks a bit like the problems you can have when there isn't sufficient memory bandwidth available (I recall getting similar effects when I was seeing how low I could go on my old X850XT to reduce its temperature when not gaming) so maybe the chip's memory clock isn't being raised high enough for some reason.
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Lebkoungcity
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PostPosted: Wed Apr 08, 2020 9:20 pm    Post subject: Reply with quote

Thanks a lot for your input!
Unfortunately this didn't help. There was no change when I echoed the mentioned settings in the files.
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Goverp
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PostPosted: Thu Apr 09, 2020 9:41 am    Post subject: Reply with quote

IIUC the following shouldn't apply to your system, but it might be worth trying anyway. There's a similar problem with AMD STONEY graphics engines that can be mitigated by disabling the IOMMU. I think you can do that with a parameter on the kernel boot command line, and if it works, you can change your kernel config. If it doesn't work, it may be worth googling for the STONEY IOMMU problem and see if it sheds any other light.
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Lebkoungcity
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PostPosted: Thu Apr 09, 2020 11:55 am    Post subject: Reply with quote

Goverp wrote:
IIUC the following shouldn't apply to your system, but it might be worth trying anyway. There's a similar problem with AMD STONEY graphics engines that can be mitigated by disabling the IOMMU. I think you can do that with a parameter on the kernel boot command line, and if it works, you can change your kernel config. If it doesn't work, it may be worth googling for the STONEY IOMMU problem and see if it sheds any other light.


Thanks! I tried it and added on the grub2-command-line these different parameters and booted each time:
iommu=off
iommu=noforce
iommu=force
iommu=soft
intel_iommu=off
But each time sddm still showed these flickering stripes.
Just in case, each time I also searched dmsg, /var/log/messages and Xorg.0.log for entries with 'iommu' oder 'IOMMU' in it, but I didn't find anything.

Now I try to find something suitable about the STONEY IOMMU problem and hope I'm able to understand enough to break it down to my issue :wink:
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Lebkoungcity
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PostPosted: Fri Apr 10, 2020 10:59 am    Post subject: Reply with quote

In the meantime I tried sys-kernel/gentoo-sources-5.6.3 but there's no difference.
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