Oops, I forgot to attach more details about the graphics card that I use. Here's the output of lspci -v: 02:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Turks [Radeon HD 6670] (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device 03ea Flags: bus master, fast devsel, latency 0, IRQ 47 Memory at d0000000 (64-bit, prefetchable) [size=256M] Memory at febe0000 (64-bit, non-prefetchable) [size=128K] I/O ports at e800 [size=256] Expansion ROM at febc0000 [disabled] [size=128K] Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150] Advanced Error Reporting Kernel driver in use: radeon 02:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Turks/Whistler HDMI Audio [Radeon HD 6000 Series] Subsystem: ASUSTeK Computer Inc. Device aa90 Flags: bus master, fast devsel, latency 0, IRQ 48 Memory at febbc000 (64-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Capabilities: [150] Advanced Error Reporting Kernel driver in use: snd_hda_intel
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