Seguindo a resposta de Dave Rook que o Photoshop realmente não funciona com várias GPUs - e isso é especialmente aparente com gráficos comutáveis - você pode tentar transformar a renderização acelerada por GPU em Basic
ou desativá-la completamente. Pode haver um pequeno impacto no desempenho, mas desde que você não esteja fazendo nada intensivo e / ou possa esperar um pouco, isso pode ser preferível ao remover um monitor.
Para desativar a aceleração da GPU , desmarque Use Graphics Processor
(mencionado na etapa 2, execute a ação oposto desmarcando-a ). Para mudar para o modo Básico, altere a opção mencionada no passo 3:
GPU/OpenGL preferences in Photoshop CS6
The advantages of using a compatible video card (GPU) with Photoshop
are that you can experience better performance and more features.
Problems can occur if you have an older video card with limited VRAM.
They can also occur if you use other programs that use the GPU at the
same time as Photoshop.
Choose Edit > Preferences (Windows) or Photoshop > Preferences (Mac OS).
In the Performance panel, make sure that Use Graphics Processor is selected in GPU Settings.
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Click Advanced Settings and specify the following options:
Mode > Basic Uses the least amount of GPU memory and enables basic OpenGL features.
Mode > Normal Uses more GPU memory and enables GPU-based color matching, tone mapping, and checkerboard blending.
Mode > Advanced Provides the benefits of Normal mode as well as newer OpenGL advances that can result in improved performance.
Use Graphics Processor to Accelerate Computation
Use OpenCL Uses the GPU to accelerate the new blur filters (Field Blur, Iris Blur, and Tilt-Shift). OpenCL is only available on newer GPUs that support OpenCL v1.1 or later.
Anti-Alias Guides And Paths Allows the GPU hardware to smooth the edges of drawn guides and paths.
30-bit Display (Windows only) Allows Photoshop to display 30-bit data directly to screen on video cards that support it