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I have some old ASUS laptop with this specs,

CPU       : AMD A6-3400M APU with Radeon(tm) HD Graphics
Mainboard : ASUSTeK Computer Inc. K43TA
iGPU      : Radeon HD 6520G
dGPU      : Radeon HD 6750M

since ubuntu 16.04, i'm still using this kernel (fyi: it's xenial kernel) until right now.

4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

cause when i'm boot up with newer kernel, the display going blank and i can't switch to terminal at all. This is dmesg output after boot up using current kernel.

[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic root=UUID=7a72af1e-ccca-4bf4-867b-fc212a1662ea ro quiet splash radeon.modeset=1 vt.handoff=1
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic root=UUID=7a72af1e-ccca-4bf4-867b-fc212a1662ea ro quiet splash radeon.modeset=1 vt.handoff=1
[    2.414550] [drm] radeon kernel modesetting enabled.
[    2.426023] fb: switching to radeondrmfb from VESA VGA
[    2.426818] radeon 0000:00:01.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used)
[    2.426822] radeon 0000:00:01.0: GTT: 1024M 0x0000000020000000 - 0x000000005FFFFFFF
[    2.426974] [drm] radeon: 512M of VRAM memory ready
[    2.426976] [drm] radeon: 1024M of GTT memory ready.
[    2.427231] [drm] radeon: dpm initialized
[    2.441271] radeon 0000:00:01.0: WB enabled
[    2.441275] radeon 0000:00:01.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff8801c187fc00
[    2.441278] radeon 0000:00:01.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff8801c187fc0c
[    2.442010] radeon 0000:00:01.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90001832118
[    2.442034] radeon 0000:00:01.0: radeon: MSI limited to 32-bit
[    2.442251] radeon 0000:00:01.0: radeon: using MSI.
[    2.442288] [drm] radeon: irq initialized.
[    3.067054] [drm] radeon atom DIG backlight initialized
[    3.169988] fbcon: radeondrmfb (fb0) is primary device
[    3.170109] radeon 0000:00:01.0: fb0: radeondrmfb frame buffer device
[    3.188660] [drm] Initialized radeon 2.43.0 20080528 for 0000:00:01.0 on minor 0
[    3.188879] radeon 0000:01:00.0: enabling device (0000 -> 0003)
[    3.302029] radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
[    3.302034] radeon 0000:01:00.0: GTT: 1024M 0x0000000040000000 - 0x000000007FFFFFFF
[    3.302065] [drm] radeon: 1024M of VRAM memory ready
[    3.302068] [drm] radeon: 1024M of GTT memory ready.
[    3.306780] [drm] radeon: dpm initialized
[    3.311928] radeon 0000:01:00.0: WB enabled
[    3.311934] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8801c162bc00
[    3.311938] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8801c162bc0c
[    3.313531] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90002432118
[    3.313538] radeon 0000:01:00.0: radeon: MSI limited to 32-bit
[    3.313703] radeon 0000:01:00.0: radeon: using MSI.
[    3.313814] [drm] radeon: irq initialized.
[    4.178672] [drm] Initialized radeon 2.43.0 20080528 for 0000:01:00.0 on minor 1
[   18.449555] radeon 0000:01:00.0: Refused to change power state, currently in D3
[   18.525582] radeon 0000:01:00.0: Refused to change power state, currently in D3
[   18.541583] radeon 0000:01:00.0: Refused to change power state, currently in D3
[   18.542671] radeon 0000:01:00.0: GPU softreset: 0x00000BDD
[   18.542674] radeon 0000:01:00.0:   GRBM_STATUS               = 0xFFFFFFFF
[   18.542677] radeon 0000:01:00.0:   GRBM_STATUS_SE0           = 0xFFFFFFFF
[   18.542679] radeon 0000:01:00.0:   GRBM_STATUS_SE1           = 0xFFFFFFFF
[   18.542682] radeon 0000:01:00.0:   SRBM_STATUS               = 0xFFFFFFFF
[   18.542684] radeon 0000:01:00.0:   SRBM_STATUS2              = 0xFFFFFFFF
[   18.542687] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0xFFFFFFFF
[   18.542689] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0xFFFFFFFF
[   18.542692] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0xFFFFFFFF
[   18.542694] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0xFFFFFFFF
[   18.542697] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0xFFFFFFFF
[   20.073993] radeon 0000:01:00.0: Wait for MC idle timedout !
[   20.073996] radeon 0000:01:00.0: GRBM_SOFT_RESET=0xFFFFFFFF
[   20.074051] radeon 0000:01:00.0: SRBM_SOFT_RESET=0xFFFFFFFF
[   20.075203] radeon 0000:01:00.0:   GRBM_STATUS               = 0xFFFFFFFF
[   20.075205] radeon 0000:01:00.0:   GRBM_STATUS_SE0           = 0xFFFFFFFF
[   20.075208] radeon 0000:01:00.0:   GRBM_STATUS_SE1           = 0xFFFFFFFF
[   20.075210] radeon 0000:01:00.0:   SRBM_STATUS               = 0xFFFFFFFF
[   20.075212] radeon 0000:01:00.0:   SRBM_STATUS2              = 0xFFFFFFFF
[   20.075215] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0xFFFFFFFF
[   20.075217] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0xFFFFFFFF
[   20.075220] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0xFFFFFFFF
[   20.075222] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0xFFFFFFFF
[   20.075225] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0xFFFFFFFF
[   25.081808] [drm:atom_op_jump [radeon]] *ERROR* atombios stuck in loop for more than 5secs aborting
[   25.081833] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing CEBE (len 62, WS 0, PS 0) @ 0xCEDA
[   25.081864] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing BBBE (len 1036, WS 4, PS 0) @ 0xBCBB
[   25.081895] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing BB54 (len 76, WS 0, PS 8) @ 0xBB5C
[   25.082103] [drm:radeon_pm_resume [radeon]] *ERROR* radeon: dpm resume failed
[   26.592465] radeon 0000:01:00.0: Wait for MC idle timedout !
[   26.780934] radeon 0000:01:00.0: Wait for MC idle timedout !
[   26.798881] radeon 0000:01:00.0: WB enabled
[   26.798887] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8801c162bc00
[   26.798892] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8801c162bc0c
[   26.807958] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90002432118
[   27.015887] [drm:r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xFFFFFFFF)
[   27.015933] [drm:evergreen_resume [radeon]] *ERROR* evergreen startup failed on resume
[   27.016042] [drm:radeon_pm_resume [radeon]] *ERROR* radeon: dpm resume failed
[   32.018274] [drm:atom_op_jump [radeon]] *ERROR* atombios stuck in loop for more than 5secs aborting
[   32.018306] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing C568 (len 1136, WS 0, PS 0) @ 0xC592
[   56.772265] radeon 0000:01:00.0: Refused to change power state, currently in D3
[   56.788145] radeon 0000:01:00.0: Refused to change power state, currently in D3
[   56.808054] radeon 0000:01:00.0: Refused to change power state, currently in D3
[   56.809153] radeon 0000:01:00.0: GPU softreset: 0x00000BDD
[   56.809159] radeon 0000:01:00.0:   GRBM_STATUS               = 0xFFFFFFFF
[   56.809165] radeon 0000:01:00.0:   GRBM_STATUS_SE0           = 0xFFFFFFFF
[   56.809169] radeon 0000:01:00.0:   GRBM_STATUS_SE1           = 0xFFFFFFFF
[   56.809174] radeon 0000:01:00.0:   SRBM_STATUS               = 0xFFFFFFFF
[   56.809179] radeon 0000:01:00.0:   SRBM_STATUS2              = 0xFFFFFFFF
[   56.809183] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0xFFFFFFFF
[   56.809188] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0xFFFFFFFF
[   56.809193] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0xFFFFFFFF
[   56.809197] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0xFFFFFFFF
[   56.809202] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0xFFFFFFFF
[   58.391485] radeon 0000:01:00.0: Wait for MC idle timedout !
[   58.391492] radeon 0000:01:00.0: GRBM_SOFT_RESET=0xFFFFFFFF
[   58.391549] radeon 0000:01:00.0: SRBM_SOFT_RESET=0xFFFFFFFF
[   58.392705] radeon 0000:01:00.0:   GRBM_STATUS               = 0xFFFFFFFF
[   58.392710] radeon 0000:01:00.0:   GRBM_STATUS_SE0           = 0xFFFFFFFF
[   58.392715] radeon 0000:01:00.0:   GRBM_STATUS_SE1           = 0xFFFFFFFF
[   58.392720] radeon 0000:01:00.0:   SRBM_STATUS               = 0xFFFFFFFF
[   58.392724] radeon 0000:01:00.0:   SRBM_STATUS2              = 0xFFFFFFFF
[   58.392729] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0xFFFFFFFF
[   58.392734] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0xFFFFFFFF
[   58.392738] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0xFFFFFFFF
[   58.392743] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0xFFFFFFFF
[   58.392748] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0xFFFFFFFF
[   63.396606] [drm:atom_op_jump [radeon]] *ERROR* atombios stuck in loop for more than 5secs aborting
[   63.396668] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing CEBE (len 62, WS 0, PS 0) @ 0xCEDA
[   63.396723] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing BBBE (len 1036, WS 4, PS 0) @ 0xBCBB
[   63.396777] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing BB54 (len 76, WS 0, PS 8) @ 0xBB5C
[   63.397116] [drm:radeon_pm_resume [radeon]] *ERROR* radeon: dpm resume failed
[   65.039000] radeon 0000:01:00.0: Wait for MC idle timedout !
[   65.246544] radeon 0000:01:00.0: Wait for MC idle timedout !
[   65.265159] radeon 0000:01:00.0: WB enabled
[   65.265165] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff8801c162bc00
[   65.265170] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff8801c162bc0c
[   65.274267] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90002432118
[   65.486199] [drm:r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xFFFFFFFF)
[   65.486253] [drm:evergreen_resume [radeon]] *ERROR* evergreen startup failed on resume
[   65.486507] [drm:radeon_pm_resume [radeon]] *ERROR* radeon: dpm resume failed
[   70.489006] [drm:atom_op_jump [radeon]] *ERROR* atombios stuck in loop for more than 5secs aborting
[   70.489049] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing C568 (len 1136, WS 0, PS 0) @ 0xC592

Is any solution to fix this problem?

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