[Bug 91617] [BDW] Incorrect rendering in CS:GO

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91617

Eero Tamminen <eero.t.tamminen at intel.com> changed:

           What    |Removed                     |Added
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                 CC|                            |eero.t.tamminen at intel.com

--- Comment #12 from Eero Tamminen <eero.t.tamminen at intel.com> ---
Could you run Steam from terminal and start the game & report whether there are
e.g. any Mesa shader compiler errors?

(In reply to Matthieu Bouron from comment #2)
> I also experience better framerates with the ivy bridge setup (Intel(R)
> Core(TM) i7-3520M CPU @ 2.90GHz). At the same resolution, using the same
> video settings on the following benchmark test
> http://steamcommunity.com/sharedfiles/filedetails/?id=500334237:
>   * the ivy bridge setup gives 42fps average.

16 EUs @ 1250 Mhz

>   * the broadwell setup gives 31fps average.

24 EUs @ 950 Mhz  -> More ALU power


> The same performance difference appears running glxgears fullscreen (same
> resolution) with vblank_mode=0
>
> There is not trace of cpu throttling in dmesg during the tests.
> The gpu frequency seems to be stuck at 950mhz during the test most of the
> time. It varies from time to time to 900mhz
> (using the intel_gpu_frequency tool).

I think that just tells (or sets) kernel GPU frequency requests, it doesn't
report at what speed GPU is actually run (tgat can be limited by firmware due
to TDP or temperature).

You need to poll actual GPU frequency, e.g. like this (as root):
  while true; do cat /sys/class/drm/card0/gt_act_freq_mhz; sleep 1; done

If your GPU freq doesn't get TDP limited [1], you either have slower memory in
BDW, or you use only one memory channel.  Check "sudo dmidecode" output, it
will tell in which channels your memory is and what is its speed.

[1] Your BDW seems to have 15W limit (while your IVB has 35W limit):
http://ark.intel.com/products/85215/Intel-Core-i7-5600U-Processor-4M-Cache-up-to-3_20-GHz

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