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It's been happening during the last month or so, around the first big team clash, when the ultis are used, the computer freezes for like 5 seconds, and then reboots. Before this, the computer used to freeze during the first clash, but it recovered. Before that, I played Dota2 for a lot of months without any problem. I have an FX6100 and HD7770. I use the open source drivers.
Check the error out log, I get something like this:
Apr 06 21:39:24 arch gdm-Xorg-:0[307]: (WW) RADEON(0): flip queue failed: Device or resource busy
Apr 06 21:39:24 arch gdm-Xorg-:0[307]: (WW) RADEON(0): Page flip failed: Device or resource busy
Apr 06 21:40:21 arch steam.desktop[6478]: [2015-04-0Installing breakpad exception handler for appid(steam)/version(1424305157)
Apr 06 21:40:22 arch steam.desktop[6478]: Installing breakpad exception handler for appid(steam)/version(1424305157)
Apr 06 21:40:23 arch steam.desktop[6478]: Installing breakpad exception handler for appid(steam)/version(1424305157)
Apr 06 21:48:08 arch gdm-Xorg-:0[307]: (WW) RADEON(0): radeon_dri2_flip_event_handler: Pageflip completion event has impossible msc 331918 < target_msc 331919
Apr 06 21:51:52 arch kernel: radeon 0000:01:00.0: GPU fault detected: 147 0x000c0401
Apr 06 21:51:52 arch kernel: radeon 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x0FF80000
Apr 06 21:51:52 arch kernel: radeon 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0C004001
Apr 06 21:51:52 arch kernel: VM fault (0x01, vmid 6) at page 267911168, read from TC (4)
Apr 06 21:52:02 arch kernel: radeon 0000:01:00.0: ring 4 stalled for more than 10083msec
Apr 06 21:52:02 arch kernel: radeon 0000:01:00.0: GPU lockup (current fence id 0x0000000000028b69 last fence id 0x0000000000028b6e on ring 4)
Apr 06 21:52:03 arch kernel: radeon 0000:01:00.0: Saved 652 dwords of commands on ring 0.
Apr 06 21:52:03 arch kernel: radeon 0000:01:00.0: GPU softreset: 0x000000ED
Apr 06 21:52:03 arch kernel: radeon 0000:01:00.0: GRBM_STATUS = 0xE65E4028
Apr 06 21:52:03 arch kernel: radeon 0000:01:00.0: GRBM_STATUS_SE0 = 0xCF800000
Apr 06 21:52:03 arch kernel: radeon 0000:01:00.0: GRBM_STATUS_SE1 = 0x00000006
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