[Intel-gfx] [PATCH 1/2] Give up on edid retries when i2c tells us that bus is not there

Jean Delvare khali at linux-fr.org
Thu Oct 20 06:13:55 PDT 2011

On Thu, 20 Oct 2011 14:33:39 +0200, Jean Delvare wrote:
> That being said, even then the whole probe sequence shouldn't exceed
> 10 ms, which I wouldn't expect a user to notice. The user-reported 4
> second delay when running xrandr can't be caused by this. 4 seconds for
> 15 attempts is 250 ms per attempt, this looks like a timeout due to
> non-functional bus, not a nack. Not that 250 ms is 1 jiffy for HZ=250,

D'oh. Today is not my day, I can't believe I wrote this :/ 1 jiffy is
obviously 4 ms only at HZ=250. So I can't explain why it is taking so
much time on the reporter's machine.

> which I guess was what the reporting user was running. So even with
> your patch, there's still 750 ms to wait, I don't think this is
> acceptable. You really have to fix that I2C bus or skip probing it.

This conclusion probably still holds.

Jean Delvare

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