O que está causando esse erro? Não é possível encontrar muita informação sobre isso. Estou correndo 17.10.
Pelo que entendi, X está tentando usar o driver Evergreen , embora Seymour faça parte de CAICOS , que é parte de Northern Island de acordo com this .
lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] (rev ff)
dmesg | egrep 'drm|radeon'
[ 1.207241] [drm] radeon kernel modesetting enabled.
[ 1.207572] radeon 0000:01:00.0: enabling device (0006 -> 0007)
[ 1.207714] [drm] initializing kernel modesetting (CAICOS 0x1002:0x6760 0x17AA:0x3976 0x00).
[ 1.291311] [drm] GPU not posted. posting now...
[ 1.295011] radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
[ 1.295012] radeon 0000:01:00.0: GTT: 1024M 0x0000000040000000 - 0x000000007FFFFFFF
[ 1.295015] [drm] Detected VRAM RAM=1024M, BAR=256M
[ 1.295016] [drm] RAM width 64bits DDR
[ 1.295166] [drm] radeon: 1024M of VRAM memory ready
[ 1.295167] [drm] radeon: 1024M of GTT memory ready.
[ 1.295184] [drm] Loading CAICOS Microcode
[ 1.295251] [drm] Internal thermal controller without fan control
[ 1.299498] [drm] radeon: dpm initialized
[ 1.299567] [drm] GART: num cpu pages 262144, num gpu pages 262144
[ 1.300134] [drm] PCIE gen 2 link speeds already enabled
[ 1.304594] [drm] PCIE GART of 1024M enabled (table at 0x0000000000162000).
[ 1.304704] radeon 0000:01:00.0: WB enabled
[ 1.304706] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0x000000006e79966d
[ 1.304707] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0x00000000bbc7520b
[ 1.305454] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0x0000000021fee4f2
[ 1.305456] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.305456] [drm] Driver supports precise vblank timestamp query.
[ 1.305457] radeon 0000:01:00.0: radeon: MSI limited to 32-bit
[ 1.305498] radeon 0000:01:00.0: radeon: using MSI.
[ 1.305540] [drm] radeon: irq initialized.
[ 1.420642] [drm] Memory usable by graphics device = 2048M
[ 1.420644] [drm] Replacing VGA console driver
[ 1.426085] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.426086] [drm] Driver supports precise vblank timestamp query.
[ 1.428591] radeon 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=none
[ 1.532365] [drm:r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD)
[ 1.532372] radeon 0000:01:00.0: disabling GPU acceleration
[ 1.534763] [drm] Radeon Display Connectors
[ 1.545871] [drm] Initialized radeon 2.50.0 20080528 for 0000:01:00.0 on minor 0
[ 1.547151] [drm] Initialized i915 1.6.0 20171023 for 0000:00:02.0 on minor 1
[ 1.745106] fbcon: inteldrmfb (fb0) is primary device
[ 2.648838] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 19.944489] [drm] PCIE gen 2 link speeds already enabled
[ 19.945675] radeon 0000:01:00.0: No VRAM object for PCIE GART.
[ 19.945701] [drm:evergreen_resume [radeon]] *ERROR* evergreen startup failed on resume
[ 28.680379] [drm] PCIE gen 2 link speeds already enabled
[ 28.681572] radeon 0000:01:00.0: No VRAM object for PCIE GART.
[ 28.681601] [drm:evergreen_resume [radeon]] *ERROR* evergreen startup failed on resume
[ 37.966072] [drm] PCIE gen 2 link speeds already enabled
[ 37.967258] radeon 0000:01:00.0: No VRAM object for PCIE GART.
[ 37.967310] [drm:evergreen_resume [radeon]] *ERROR* evergreen startup failed on resume
[ 63.117854] [drm] PCIE gen 2 link speeds already enabled
[ 63.119041] radeon 0000:01:00.0: No VRAM object for PCIE GART.
[ 63.119069] [drm:evergreen_resume [radeon]] *ERROR* evergreen startup failed on resume