Comment 6 for bug 1174042

Exactly the same problem here (XPS 1640) on a fresh install (livecd boot without problem, but as soon the system is installed on the disk, it doesn't boot...) I have a dark screen instead on the login screen. In dmesg, we can see this :

Apr 28 16:24:18 mat-laptop kernel: [ 35.584061] radeon 0000:01:00.0: GPU lockup CP stall for more than 10000msec
Apr 28 16:24:18 mat-laptop kernel: [ 35.584069] radeon 0000:01:00.0: GPU lockup (waiting for 0x0000000000000003 last fence id 0x0000000000000001)
Apr 28 16:24:18 mat-laptop kernel: [ 35.585105] radeon 0000:01:00.0: Saved 89 dwords of commands on ring 0.
Apr 28 16:24:18 mat-laptop kernel: [ 35.585108] radeon 0000:01:00.0: GPU softreset: 0x00000003
Apr 28 16:24:18 mat-laptop kernel: [ 35.745021] radeon 0000:01:00.0: R_008010_GRBM_STATUS = 0xA0003030
Apr 28 16:24:18 mat-laptop kernel: [ 35.745024] radeon 0000:01:00.0: R_008014_GRBM_STATUS2 = 0x00000003
Apr 28 16:24:18 mat-laptop kernel: [ 35.745026] radeon 0000:01:00.0: R_000E50_SRBM_STATUS = 0x200200C0
Apr 28 16:24:18 mat-laptop kernel: [ 35.745029] radeon 0000:01:00.0: R_008674_CP_STALLED_STAT1 = 0x00000000
Apr 28 16:24:18 mat-laptop kernel: [ 35.745031] radeon 0000:01:00.0: R_008678_CP_STALLED_STAT2 = 0x00000000
Apr 28 16:24:18 mat-laptop kernel: [ 35.745033] radeon 0000:01:00.0: R_00867C_CP_BUSY_STAT = 0x00000800
Apr 28 16:24:18 mat-laptop kernel: [ 35.745036] radeon 0000:01:00.0: R_008680_CP_STAT = 0x800000C1
Apr 28 16:24:18 mat-laptop kernel: [ 35.745038] radeon 0000:01:00.0: R_008020_GRBM_SOFT_RESET=0x00007FEE
Apr 28 16:24:18 mat-laptop kernel: [ 35.759919] radeon 0000:01:00.0: R_008020_GRBM_SOFT_RESET=0x00000001
Apr 28 16:24:18 mat-laptop kernel: [ 35.774806] radeon 0000:01:00.0: R_008010_GRBM_STATUS = 0xA0003030
Apr 28 16:24:18 mat-laptop kernel: [ 35.774808] radeon 0000:01:00.0: R_008014_GRBM_STATUS2 = 0x00000003
Apr 28 16:24:18 mat-laptop kernel: [ 35.774811] radeon 0000:01:00.0: R_000E50_SRBM_STATUS = 0x200280C0
Apr 28 16:24:18 mat-laptop kernel: [ 35.774813] radeon 0000:01:00.0: R_008674_CP_STALLED_STAT1 = 0x00000000
Apr 28 16:24:18 mat-laptop kernel: [ 35.774815] radeon 0000:01:00.0: R_008678_CP_STALLED_STAT2 = 0x00000000
Apr 28 16:24:18 mat-laptop kernel: [ 35.774818] radeon 0000:01:00.0: R_00867C_CP_BUSY_STAT = 0x00000000
Apr 28 16:24:18 mat-laptop kernel: [ 35.774820] radeon 0000:01:00.0: R_008680_CP_STAT = 0x80100000
Apr 28 16:24:18 mat-laptop kernel: [ 35.780569] radeon 0000:01:00.0: GPU reset succeeded, trying to resume
Apr 28 16:24:18 mat-laptop kernel: [ 35.797540] [drm] probing gen 2 caps for device 8086:2a41 = 1/0
Apr 28 16:24:18 mat-laptop kernel: [ 35.947561] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
Apr 28 16:24:18 mat-laptop kernel: [ 35.947598] radeon 0000:01:00.0: WB enabled
Apr 28 16:24:18 mat-laptop kernel: [ 35.947601] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff880133b34c00
Apr 28 16:24:18 mat-laptop kernel: [ 35.947604] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff880133b34c0c
Apr 28 16:24:18 mat-laptop kernel: [ 36.129762] [drm:r600_ring_test] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD)
Apr 28 16:24:18 mat-laptop kernel: [ 36.129765] [drm:r600_resume] *ERROR* r600 startup failed on resume

I suspect a regression introduced by hyperz support in mesa on ati...