[Intel-gfx] [BUG] HDMI 12bpc causing occasional flickering and blanking

Tore Anderson tore at fud.no
Fri Feb 19 19:55:02 UTC 2016

* Tore Anderson

> * Ville Syrjälä
> > Could you test the following hack while using a 1920x1080 mode with
> > 148.5 MHz dotclock, and see if there's any improvement?  
> I think it might be an improvement, that is, the blanking/flickers
> seems to occur less often than it did with 8ed1804, but it is not
> completely fixed.

Hi again Ville,

I spoke too soon. I've been doing some more testing with current Git
master (e7d04bf). I'm now certain that your patch makes no difference
whatsoever, the flickering/blanking is just as bad as before.

The intensity/frequency of the problems vary significantly, so when I
tested your patch previously I must have hit one of the better periods.
As I write this, however, the computer is essentially rendered
unusable. (I have no idea what causes this variance, unfortunately.)

Do you (or anyone else for that matter) have any other ideas?

By the way: Is it possible to disable HDMI 12bpc in a way that doesn't
require me to patch and rebuild the kernel drivers, such as a kernel
module parameter or sysfs setting? (I prefer to simply use the upstream
Fedora kernel RPMs, but this issue is currently making that impossible.)


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