I have a Acer Aspire V3-551G-X419 laptop which has a 7660G (on the APU; iirc it's a A10-4600M) + a 7670M dedicated chip for graphics. This laptop is also muxless.
I'm running Xubuntu 14.04 with 3.14.0-999-lowlatency (yesterday's daily kernel from PPA), and oibaf's PPA. I have radeon.dpm enabled, and have also done the setprovideroffloadsink thing for Prime (on auto-start). SwapBuffersWait is disabled, and vblank_mode is 0. I use DRI_PRIME= 0 and 1 to specify the GPU to use.
On all the benchmarks I've done (TF2, CSS, Dota 2 timedemos and GtkPerf), the 7670M dGPU seems to score slightly lower than the 7660G iGPU. There isn't a significant difference in most cases, but I would expect the 7670M to perform far better than a 7660G. I also noticed significant tearing with a game in Wine (osu!) also on the dGPU.
I'm wondering if this is expected behaviour currently just given the state of the open-source drivers, or maybe there's some setting somewhere I may of overlooked? Also for a slightly unrelated question, is there anyway to use the dGPU without having compositing enabled?
I'm running Xubuntu 14.04 with 3.14.0-999-lowlatency (yesterday's daily kernel from PPA), and oibaf's PPA. I have radeon.dpm enabled, and have also done the setprovideroffloadsink thing for Prime (on auto-start). SwapBuffersWait is disabled, and vblank_mode is 0. I use DRI_PRIME= 0 and 1 to specify the GPU to use.
On all the benchmarks I've done (TF2, CSS, Dota 2 timedemos and GtkPerf), the 7670M dGPU seems to score slightly lower than the 7660G iGPU. There isn't a significant difference in most cases, but I would expect the 7670M to perform far better than a 7660G. I also noticed significant tearing with a game in Wine (osu!) also on the dGPU.
I'm wondering if this is expected behaviour currently just given the state of the open-source drivers, or maybe there's some setting somewhere I may of overlooked? Also for a slightly unrelated question, is there anyway to use the dGPU without having compositing enabled?
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