Description of problem: I have an AMD notebook, the ASUS X53T, with two gpu cards, both Ati. 0:IGD:+:Pwr:0000:00:01.0 1:DIS: :Off:0000:01:00.0 Card0 is Advanced Micro Devices [AMD/ATI] BeaverCreek [Radeon HD 6520G] Card1 is Advanced Micro Devices [AMD/ATI] Thames [Radeon HD 7500M/7600M Series] If I try to connect with outputs the discrete card (Card1) the screen goes black and I can only force reboot through kernel sysrq or connect with ssh from another machine. The switch never worked for me, I bought the notebook one year ago. How reproducible: Try to connects discrete graphics with outputs trough vgaswitcheroo interface. Steps to Reproduce: 1. echo DIS > /sys/kernel/debug/vgaswitcheroo/switch Actual results: Screen goes black immediately and cannot be unblocked Expected results: Switch to discrete card Additional info: Dmesg reports a lot of errors: [dom ago 18 22:29:53 2013] vga_switcheroo: client 0 refused switch [dom ago 18 22:29:53 2013] vga_switcheroo: setting delayed switch to client 1 [dom ago 18 22:29:56 2013] radeon: switched on [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: Refused to change power state, currently in D3 [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: Refused to change power state, currently in D3 [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: GPU softreset: 0x00000BDD [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: GRBM_STATUS = 0xFFFFFFFF [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: GRBM_STATUS_SE0 = 0xFFFFFFFF [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: GRBM_STATUS_SE1 = 0xFFFFFFFF [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: SRBM_STATUS = 0xFFFFFFFF [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: SRBM_STATUS2 = 0xFFFFFFFF [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: R_008674_CP_STALLED_STAT1 = 0xFFFFFFFF [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: R_008678_CP_STALLED_STAT2 = 0xFFFFFFFF [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: R_00867C_CP_BUSY_STAT = 0xFFFFFFFF [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: R_008680_CP_STAT = 0xFFFFFFFF [dom ago 18 22:29:56 2013] radeon 0000:01:00.0: R_00D034_DMA_STATUS_REG = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: Wait for MC idle timedout ! [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: GRBM_SOFT_RESET=0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: SRBM_SOFT_RESET=0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: GRBM_STATUS = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: GRBM_STATUS_SE0 = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: GRBM_STATUS_SE1 = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: SRBM_STATUS = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: SRBM_STATUS2 = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: R_008674_CP_STALLED_STAT1 = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: R_008678_CP_STALLED_STAT2 = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: R_00867C_CP_BUSY_STAT = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: R_008680_CP_STAT = 0xFFFFFFFF [dom ago 18 22:29:58 2013] radeon 0000:01:00.0: R_00D034_DMA_STATUS_REG = 0xFFFFFFFF [dom ago 18 22:30:03 2013] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [dom ago 18 22:30:03 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE9C (len 62, WS 0, PS 0) @ 0xCEB8 [dom ago 18 22:30:03 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing BB9C (len 1036, WS 4, PS 0) @ 0xBC99 [dom ago 18 22:30:03 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing BB32 (len 76, WS 0, PS 8) @ 0xBB3A [dom ago 18 22:30:04 2013] radeon 0000:01:00.0: Wait for MC idle timedout ! [dom ago 18 22:30:05 2013] radeon 0000:01:00.0: Wait for MC idle timedout ! [dom ago 18 22:30:05 2013] [drm] PCIE GART of 512M enabled (table at 0x0000000000273000). [dom ago 18 22:30:05 2013] radeon 0000:01:00.0: WB enabled [dom ago 18 22:30:05 2013] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffff880240604c00 [dom ago 18 22:30:05 2013] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffff880240604c0c [dom ago 18 22:30:05 2013] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc900232b2118 [dom ago 18 22:30:05 2013] [drm:r600_ring_test] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xFFFFFFFF) [dom ago 18 22:30:05 2013] [drm:evergreen_resume] *ERROR* evergreen startup failed on resume [dom ago 18 22:30:10 2013] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [dom ago 18 22:30:10 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing C546 (len 1136, WS 0, PS 0) @ 0xC570 [dom ago 18 22:30:15 2013] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [dom ago 18 22:30:15 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE9C (len 62, WS 0, PS 0) @ 0xCEB8 [dom ago 18 22:30:20 2013] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [dom ago 18 22:30:20 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE9C (len 62, WS 0, PS 0) @ 0xCEB8 [dom ago 18 22:30:25 2013] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [dom ago 18 22:30:25 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE9C (len 62, WS 0, PS 0) @ 0xCEB8 [dom ago 18 22:30:30 2013] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [dom ago 18 22:30:30 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE9C (len 62, WS 0, PS 0) @ 0xCEB8 [dom ago 18 22:30:35 2013] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [dom ago 18 22:30:35 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE9C (len 62, WS 0, PS 0) @ 0xCEB8 [dom ago 18 22:30:40 2013] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [dom ago 18 22:30:40 2013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE9C (len 62, WS 0, PS 0) @ 0xCEB8
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