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Reading EDID kills system?
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The_Great_Sephiroth
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PostPosted: Mon Sep 07, 2020 8:26 pm    Post subject: Reading EDID kills system? Reply with quote

I have an issue with x11-misc/read-edid. When I use get-edid on either of my laptops it fails. On the newer one it hangs while doing the VBE call and you have to kill it. On my older Latitude E6400 it completes and then about a minute later the entire system freezes, requiring a hard shutdown. The latter is the system I am on now. I use get-edid > /lib/firmware/edid/1280x800_Dell_E6400.bin and it says the call is supported followed by the call failed, and about one minute later the entire system locks so hard that even the lights on the system stop flashing and are either on or off.

Images of the lockup taken from my Note 9
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turtles
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PostPosted: Wed Sep 16, 2020 2:43 am    Post subject: Reply with quote

Did you just update xorg?
You may need to do a
Code:
emerge -av x11-misc/read-edid

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roarinelk
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PostPosted: Wed Sep 16, 2020 9:07 am    Post subject: Re: Reading EDID kills system? Reply with quote

The_Great_Sephiroth wrote:
On the newer one it hangs while doing the VBE call and you have to kill it.


VBE is a legacy thing, I don't believe it's supported in newer (read: UEFI-using) systems. The VBE call probably
just trashes something untested in the bios and causes the hangs.

At least with the intel and amd kernel drivers you get a "edid" file in sysfs:
Code:
find /sys -name "edid"
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cihancan
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PostPosted: Thu Sep 17, 2020 7:20 pm    Post subject: Reply with quote

There are other ways to get edid. check /sys/devices/pci find the address belongs to your gpu and youll find edid in it.
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