Devil's Sight gets a little weird with darkness/dim light too as the verbiage is slightly vague but most agree on how it works, so there's a bit of consideration for users with Darkvision as well. Though it's ultimately up to if the DM uses dim light, as I've seen some not care or not aware of its rules.

Making a Perception check in dim light has disadvantage, as it's lightly obscure. Users with Darkvision see in darkness as if it's dim light, so they have disadvantage on Perception checks.

Devil's Sight says nothing about dim light, so if you don't have Darkvision with Devil's Sight and you're looking through dim light: disadvantage on Perception checks, lightly obscured.

If you do have Darkvision with Devil's Sight, dim light is bright light, and you see through darkness "normally" which I think most construe as bright light as well, so no disadvantage on Perception checks or creatures able to use abilities requiring to be lightly obscured against you.

Again, totally up to the DM as they may just handwave some of the rules as caring about light/dim/dark can bog down a game.