[Bug 82588] X fails to start with linus-tip or drm-next

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82588

--- Comment #6 from jospezial <jospezial at gmx.de> ---
Created attachment 105305
  --> https://bugs.freedesktop.org/attachment.cgi?id=105305&action=edit
dmesg of linux-3.17_rc2

This do I get on a Gentoo linux with xf86-video-ati-7.4.0 since linux-3.17_rc1.
X starts but GPU acceleration is disabled.

[    6.787592] [drm] Initialized drm 1.1.0 20060810
[    7.007890] [drm] radeon kernel modesetting enabled.
[    7.008441] [drm] initializing kernel modesetting (RS740 0x1002:0x796E
0x105B:0x0E13).
[    7.008456] [drm] register mmio base: 0xFEAF0000
[    7.008457] [drm] register mmio size: 65536
[    7.009087] ATOM BIOS: ATI
[    7.009102] radeon 0000:01:05.0: VRAM: 128M 0x0000000038000000 -
0x000000003FFFFFFF (128M used)
[    7.009104] radeon 0000:01:05.0: GTT: 512M 0x0000000040000000 -
0x000000005FFFFFFF
[    7.009117] [drm] Detected VRAM RAM=128M, BAR=128M
[    7.009118] [drm] RAM width 128bits DDR
[    7.009204] [TTM] Zone  kernel: Available graphics memory: 443784 kiB
[    7.009206] [TTM] Initializing pool allocator
[    7.009212] [TTM] Initializing DMA pool allocator
[    7.009235] [drm] radeon: 128M of VRAM memory ready
[    7.009236] [drm] radeon: 512M of GTT memory ready.
[    7.009251] [drm] GART: num cpu pages 131072, num gpu pages 131072
[    7.025657] [drm] radeon: 1 quad pipes, 1 z pipes initialized.
[    7.025670] [drm] PCIE GART of 512M enabled (table at 0x0000000032F00000).
[    7.025726] radeon 0000:01:05.0: WB enabled
[    7.025730] radeon 0000:01:05.0: fence driver on ring 0 use gpu addr
0x0000000040000000 and cpu addr 0xffff880032ea5000
[    7.025733] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    7.025734] [drm] Driver supports precise vblank timestamp query.
[    7.025744] [drm] radeon: irq initialized.
[    7.025753] [drm] Loading RS690/RS740 Microcode
[    7.071137] [drm] radeon: ring at 0x0000000040001000
[    7.228868] [drm:r100_ring_test] *ERROR* radeon: ring test failed
(scratch(0x15E4)=0xCAFEDEAD)
[    7.228875] [drm:r100_cp_init] *ERROR* radeon: cp isn't working (-22).
[    7.228883] radeon 0000:01:05.0: failed initializing CP (-22).
[    7.228888] radeon 0000:01:05.0: Disabling GPU acceleration
[    7.375499] [drm:r100_cp_fini] *ERROR* Wait for CP idle timeout, shutting
down CP.
[    7.521222] Failed to wait GUI idle while programming pipes. Bad things
might happen.
[    7.521467] [drm] radeon: cp finalized

With linux-3.16.1 it works.
lspci:
01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS740
[Radeon 2100]

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