radeon driver hangs : nothing else that static effect on display

Submitted by mag..@..il.com

Assigned to Default DRI bug account

Description

using latest mainline kernel I get static effect on display and no more (no login manager)

Mine distro is ubuntu 17.10 but I'm facing the same issue also with mainline kernel 4.15-rc6

from dmesg I can see, regarding drm:
$dmesg | grep drm
[ 2.659838] [drm] radeon kernel modesetting enabled.
[ 2.659890] fb: switching to radeondrmfb from VESA VGA
[ 2.661023] [drm] initializing kernel modesetting (SUMO2 0x1002:0x9645 0x1043:0x84C8 0x00).
[ 2.661163] [drm] Detected VRAM RAM=512M, BAR=256M
[ 2.661164] [drm] RAM width 32bits DDR
[ 2.661454] [drm] radeon: 512M of VRAM memory ready
[ 2.661456] [drm] radeon: 1024M of GTT memory ready.
[ 2.661464] [drm] Loading SUMO2 Microcode
[ 2.661632] [drm] Internal thermal controller without fan control
[ 2.661678] [drm] Found smc ucode version: 0x00011200
[ 2.661834] [drm] radeon: dpm initialized
[ 2.662006] [drm] GART: num cpu pages 262144, num gpu pages 262144
[ 2.675003] [drm] PCIE GART of 1024M enabled (table at 0x0000000000162000).
[ 2.675525] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 2.675525] [drm] Driver supports precise vblank timestamp query.
[ 2.675603] [drm] radeon: irq initialized.
[ 2.692149] [drm] ring test on 0 succeeded in 1 usecs
[ 2.692156] [drm] ring test on 3 succeeded in 3 usecs
[ 2.737845] [drm] ring test on 5 succeeded in 1 usecs
[ 2.757699] [drm] UVD initialized successfully.
[ 2.758193] [drm] ib test on ring 0 succeeded in 0 usecs
[ 2.758242] [drm] ib test on ring 3 succeeded in 0 usecs
[ 3.292477] [drm] ib test on ring 5 succeeded
[ 3.313397] [drm] Radeon Display Connectors
[ 3.313399] [drm] Connector 0:
[ 3.313399] [drm] VGA-1
[ 3.313400] [drm] HPD2
[ 3.313401] [drm] DDC: 0x6440 0x6440 0x6444 0x6444 0x6448 0x6448 0x644c 0x644c
[ 3.313402] [drm] Encoders:
[ 3.313402] [drm] CRT1: INTERNAL_UNIPHY2
[ 3.313403] [drm] CRT1: NUTMEG
[ 3.313403] [drm] Connector 1:
[ 3.313404] [drm] DVI-D-1
[ 3.313404] [drm] HPD1
[ 3.313406] [drm] DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c
[ 3.313406] [drm] Encoders:
[ 3.313406] [drm] DFP1: INTERNAL_UNIPHY2
[ 3.449737] [drm] fb mappable at 0xC0366000
[ 3.449738] [drm] vram apper at 0xC0000000
[ 3.449739] [drm] size 7299072
[ 3.449740] [drm] fb depth is 24
[ 3.449740] [drm] pitch is 6912
[ 3.449991] fbcon: radeondrmfb (fb0) is primary device
[ 3.527792] radeon 0000:00:01.0: fb0: radeondrmfb frame buffer device
[ 3.540468] [drm] Initialized radeon 2.50.0 20080528 for 0000:00:01.0 on minor 0
[ 80.040354] [drm] Found smc ucode version: 0x00011200
[ 80.047133] [drm] PCIE GART of 1024M enabled (table at 0x0000000000162000).
[ 80.063677] [drm] ring test on 0 succeeded in 1 usecs
[ 80.063683] [drm] ring test on 3 succeeded in 3 usecs
[ 80.109426] [drm] ring test on 5 succeeded in 1 usecs
[ 80.129306] [drm] UVD initialized successfully.
[ 81.208320] [drm:r600_ib_test [radeon]] ERROR radeon: fence wait timed out.
[ 81.208392] [drm:radeon_ib_ring_tests [radeon]] ERROR radeon: failed testing IB on GFX ring (-110).

This bug existed since older versions, I tried also mainline 4.8

Here you can see mine vga:
lspci | grep VGA
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Sumo [Radeon HD 6410D]

that actually is "AMD - A4-3300 Llano" an APU.

I'm at your disposal in case you need further information.