I also have a dedicated GPU (I can't get lshw section for it for some reason), used with the opensource driver:
VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars XTX [Radeon HD 8790M]
$ uname -a
Linux peci1-Latitude-E6540 3.13.0-65-generic #105-Ubuntu SMP Mon Sep 21 18:50:58 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
This issue didn't happen when I used the fglrx driver for the ATI card. However, using that driver, I had another problem, so I switched to the opensource one.
$ sudo lshw -C video
*-display
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0 f5800000- f5bfffff memory: d0000000- dfffffff ioport: f000(size= 64)
description: VGA compatible controller
product: 4th Gen Core Processor Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 06
width: 64 bits
clock: 33MHz
resources: irq:48 memory:
I also have a dedicated GPU (I can't get lshw section for it for some reason), used with the opensource driver:
VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars XTX [Radeon HD 8790M]
$ uname -a
Linux peci1-Latitude- E6540 3.13.0-65-generic #105-Ubuntu SMP Mon Sep 21 18:50:58 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
This issue didn't happen when I used the fglrx driver for the ATI card. However, using that driver, I had another problem, so I switched to the opensource one.