Intel Haswell support - Any updates?

[Michael Gmelin]

> On 18 Sep 2015, at 07:34, Matthias Apitz <guru at unixarea.de> wrote:
> 
>> El día Thursday, September 17, 2015 a las 11:42:01PM +0200, Nikola Pajkovsky escribió:
>> 
>> Do not run those commands in X, otherwise it hangs.
>> 
>> $ vidcontrol -i mode | grep 1920
>> 383 (0x17f) 0x0000000f G 1920x1080x32 D  8x16  0xa0000 64k 64k 0xe0000000 8100k
> 
> On my C720 the above cmd does not give any usefull information:
> 
> 
>    mode#     flags   type    size       font      window      linear buffer
> ------------------------------------------------------------------------------
>  0 (0x000) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
>  1 (0x001) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
>  2 (0x002) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
>  3 (0x003) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
>  4 (0x004) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
>  5 ...
> 
> 
> 507 (0x1fb) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
> 508 (0x1fc) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
> 509 (0x1fd) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
> 510 (0x1fe) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
> 511 (0x1ff) 0x00000000 T 0x0             0x402653478 0x280996d6 131362k  0k 0x00000000 0k
> 

Last time I checked on the c720, the correct memory areas were marked as write-combine by default (see "memcontrol list"), so you can't accomplish any further performance gains by tuning it manually.

- m