Comment # 10
on bug 99316
from mat42x@yahoo.de
I have also a Dell notebook with the same dGPU, but cannot reproduce your error with Ubuntu 16.04 kernel 4.10.0. Instead I have the problem, that the dGPU only gets powered at a low frequency, and becomes slower than the Intel GPU by doing so. When I run glmark2, I look at "/sys/kernel/debug/dri/0/radeon_pm_info" and always see the following output: default engine clock: 925000 kHz current engine clock: 299990 kHz default memory clock: 1000000 kHz current memory clock: 148990 kHz voltage: 1225 mV PCIE lanes: 16 Btw.: This dGPU cannot be connected to a CRT directly, as there seems to be no connection available at all.
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